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Alex Mitchell www.psycho-oncology.info
Department of Cancer & Molecular Medicine, Leicester Royal Infirmary
Department of Liaison Psychiatry, Leicester General Hospital
Portugal 2010Portugal 2010
WORKSHOP Day 1
Science of Screening:
Definitions, analysis, screening tools, case-finding tools,
prevalence, link with physical concerns
WORKSHOP Day 1
Science of Screening:
Definitions, analysis, screening tools, case-finding tools,
prevalence, link with physical concerns
Schedule Day 1Schedule Day 1
930-10.00 – Introduction, groups and issues
10.00-11.00 – T1 Basic science of screening
Break
11.30 – 12.30 – Group task #1
Lunch
1.30-2.30 – T2 Symptoms, Burden, Help, Needs in Cancer
Break
3.00 – 4.00 – Evaluation of a screening paper
10 Questions10 Questions
1. How do we understand screening studies
2. Can we design a screening study
3. Which instrument works best
4. Which is the most popular tool
5. How good are clinicians alone
6. Can the DT be improved
7. Is screening effective in clinical practice
8. What are the barriers to successful implementation
9. How can screening be improved
10. Do somatic symptoms interfere with the diagnosis
Incidence > Prevalence > SuvivorshipIncidence > Prevalence > Suvivorship
Changing landscape of epidemiology
10.9million incident cases (1mi breast, lung colorectal); 25mi prevalent cases
23
3
3
3
4
5
8
10
10
14
16
25
2
3
4
5
3
1
3
14
24
15
UK Rank
(12th)
(10th)
(5th)
(4th)
(6th)
(15th)
(8th)
(3rd)
(1st)
(2nd)
All others
Lip, oral cavity
Leukaemia
NHL
Bladder
Oesophagus
Liver
Stomach
Colorectum
Prostate
Lung
world (%) uk (%)
27
3
3
4
4
5
6
9
9
9
23
27
3
1
5
1
5
2
12
2
12
31
UK Rank
(7th)
(18th)
(5th)
(19th)
(4th)
(13th)
(3rd)
(11th)
(2nd)
(1st)
All others
NHL
Thyroid
Ovary
Liver
Uterus
Stomach
Lung
Cervix
Colorectum
Breast
world(%) uk(%)
Males
Most commonly diagnosed cancers worldwide
Females
Cancer Death Rates* Among Men, US,1930-2005
*Age-adjusted to the 2000 US standard population.
Source: US Mortality Data 1960-2005, US Mortality Volumes 1930-1959,
National Center for Health Statistics, Centers for Disease Control and Prevention, 2008.
0
20
40
60
80
100
1930
1935
1940
1945
1950
1955
1960
1965
1970
1975
1980
1985
1990
1995
2000
2005
Lung & bronchus
Colon & rectum
Stomach
Rate Per 100,000
Prostate
Pancreas
LiverLeukemia
Cancer Death Rates* Among Women, US,1930-2005
*Age-adjusted to the 2000 US standard population.
Source: US Mortality Data 1960-2005, US Mortality Volumes 1930-1959,
National Center for Health Statistics, Centers for Disease Control and Prevention, 2008.
0
20
40
60
80
100
1930
1935
1940
1945
1950
1955
1960
1965
1970
1975
1980
1985
1990
1995
2000
2005
Lung & bronchus
Colon & rectum
Uterus
Stomach
Breast
Ovary
Pancreas
Rate Per 100,000
0
10
20
30
40
50
60
70
80
90
100
M
elanom
aBreast(fem
ale)U
rinary
bladder
Prostate
C
olon
Allsites
R
ectum
N
on-H
odgkin
lym
phom
a
O
vary
Leukem
ia
Lung
and
bronchus
Pancreas
1975-1977
1984-1986
1996-2004
Change
5 Year Survival in US Cancers
Distress Thermometer – Pooled
Proportion
18 .4 %
12 .9 %
11.2 %
12 .3 %
8 .1%
11.9 %
5.0 %
2 .8 % 2 .6 %
7.7%
7.2 %
0.0%
2.0%
4.0%
6.0%
8.0%
10.0%
12.0%
14.0%
16.0%
18.0%
20.0%
Zero One Two Three Four Five Six Seven Eight Nine Ten
Insignificant SevereModerateMildMinimal
p124
50%
94.2%
37.4%
8 yrs N= 9282 NCS‐R
N=23 studies; 50% some treatment 33% minimal treatment N=19 studies; 30% 1 in 1/12; 10% 3 in 3 months
T1. Basic Science of ScreeningT1. Basic Science of Screening
Definitions
Graphics
Diagnostic Testing……by application (who)Diagnostic Testing……by application (who)
Routine Screening
The systematic application of a test or inquiry, to all individuals
who may have (or who have not sought medical help for that
disorder)
Targeted (High Risk)
The highly selected application of a test or inquiry, to identify
individuals at high risk of a specific disorder by virtue of
known risk factors
Adapted from Department of Health. Annual report of the national screening committee. London:
DoH, 1997.
Diagnostic Testing……by aim (why)Diagnostic Testing……by aim (why)
Screening
Rule out those without the disorder with high accuracy (high
NPV)
Case-Finding
Rule in those with the disorder with high accuracy (high PPV)
Diagnostic Testing……by method (how)Diagnostic Testing……by method (how)
Screening
A simple tool with high acceptability but good NPV
Case-Finding
An accurate tool with high PPV and NPV
Rating
Simple, patient rated, correl. With QoL and other outcomes
Defining Diagnostic Testing…by comparatorDefining Diagnostic Testing…by comparator
Accuracy (aka convergent validity)
The degree of approximation (veracity) to a robust comparator
Validity (aka criterion validity)
The degree of approximation (veracity) to a criterion reference
Precision
The degree of predictability (low SD) in the measure
Stage Type Purpose Description
Pre-clinical Development Development of the proposed tool or
test
Here the aim is to develop a screening method that is likely to help in the detection of the
underlying disorder, either in a specific setting or in all setting. Issues of acceptability of the
tool to both patients and staff must be considered in order for implementation to be
successful.
Phase
I_screen
Diagnostic validity Early diagnostic validity testing in a
selected sample and refinement of tool
The aim is to evaluate the early design of the screening method against a known (ideally
accurate) standard known as the criterion reference. In early testing the tool may be
refined, selecting most useful aspects and deleting redundant aspects in order to make the
tool as efficient (brief) as possible whilst retaining its value.
Phase
II_screen
Diagnostic validity Diagnostic validity in a representative
sample
The aim is to assess the refined tool against a criterion (gold standard) in a real world
sample where the comparator subjects may comprise several competing condition which
may otherwise cause difficulty regarding differential diagnosis.
Phase
III_screen
Implementation Screening RCT; clinicians using vs not
using a screening tool
This is an important step in which the tool is evaluated clinically in one group with access
to the new method compared to a second group (ideally selected in a randomized fashion)
who make assessments without the tool.
Phase
IV_screen
Implementation Screening implementation studies using
real-world outcomes
In this last step the screening tool /method is introduced clinically but monitored to discover
the effect on important patient outcomes such as new identifications, new cases treated
and new cases entering remission.
Development of Diagnostic Tests
Concepts: Se Sp PPV NPVConcepts: Se Sp PPV NPV
Accuracy 2x2 TableAccuracy 2x2 Table
Depression
PRESENT
Depression
ABSENT
Test +ve True +ve False +ve PPV
Test ‐ve False ‐Ve True ‐Ve NPV
Sensitivity Specificity Prevalence
Reference Standard
Disorder Present
Reference Standard
No Disorder
Test
+ve A B
A/A + B
PPV
Test
-ve C D
D/C + D
NPV
Total A / A + C
Sn
D / B + D
Sp
Basic Measures of AccuracyBasic Measures of Accuracy
Sensitivity (Se) a/(a + c) TP / (TP + FN)
A measure of accuracy defined the proportion of patients with disease in whom
the test result is positive: a/(a + c)
Specificity (Sp) d/(b + d) TN / (TN + FP)
A measure of accuracy defined as the proportion of patients without disease in
whom the test result is negative
Positive Predictive Value a/(a+b) TP / (TP + FP)
A measure of rule‐in accuracy defined as the proportion of true positives in
those that screen positive screening result, as follows
Negative Predictive Value c/(c+d) TN / (TN + FN)
A measure of rule‐out accuracy defined as the proportion of true negatives in
those that screen negative screening result, as follows
Concepts => FiguresConcepts => Figures
Graphical – Screening principles
Non-Depressed
Depressed
#
of
Individuals
#
of
Individuals
Severity of Depression
Graphical – Screening principles
Non-Depressed
Depressed
#
of
Individuals
Cut-Off
#
of
Individuals
Severity of Depression
HighLow
Graphical – Screening principles
Non-Depressed
Depressed
#
of
Individuals
Cut-Off
#
of
Individuals
Severity of Depression
HighLow
High Sensitivity >>>>
<<<< high Specificity
Graphical – Screening principles
Non-Depressed
Depressed
#
of
Individuals
Cut-Off
#
of
Individuals
Severity of Depression
HighLow
High Sensitivity >>>>
<<<< low Specificity
Can This Help establish a syndrome?Can This Help establish a syndrome?
Example: A Clear Disease [#1]Example: A Clear Disease [#1]
Disorder
Number
of
Individuals
False +veFalse +ve
True -veTrue -ve
Point of Partial Rarity
Test Result
No Disorder
False -veFalse -ve
True +veTrue +ve
Example: A Probable Syndrome [#2]Example: A Probable Syndrome [#2]
Disorder
Number
of
Individuals
False +veFalse +ve False -veFalse -ve
True -veTrue -ve
True +veTrue +ve
MMSE Cognitive Score
No Disorder
Example: A Normally Distributed Trait [#3]Example: A Normally Distributed Trait [#3]
Disorder
Number
of
Individuals
False +veFalse +ve False -veFalse -ve
True -veTrue -ve
True +veTrue +ve
MMSE Cognitive Score
No Disorder
Example: DementiaExample: Dementia
Disease?
Syndrome?
Trait?
Hubbert et al (2005) BMC GeriatricsHubbert et al (2005) BMC Geriatrics
MMSE scores for dementia (n=72)
and non-dementia (n=2735)
Huppert et al BMC Geriatrc 2005
Example: DepressionExample: Depression
Disease
Syndrome
Trait
Thompson et al (2001) n=18,414 HADS-DThompson et al (2001) n=18,414 HADS-D
0
500
1000
1500
2000
2500
3000
Zero
O
ne
Tw
o
Three
Four
Five
Six
Seven
eight
N
ine
Ten
Eleven
Tw
elve
Thirteen
Fourteen
Fifteen
SixteenSeventeen
Eighteen
PHQ9 Linear distribution
0
5
10
15
20
25
30
35
Zero
O
ne
Two
Three
Four
Five
Six
Seven
Eight
Nine
Ten
Eleven
Twelve
Thirteen
Fourteen
Fifteen
Sixteen
Seventeen
Eighteen
PHQ9 (Major Depression)
PHQ9 (Minor Depression)
PHQ9 (Non-Depressed)
Baker-Glen, Mitchell et al (2008)
T1. Science ExamplesT1. Science Examples
2x2 tables
workshop
Accuracy in wordsAccuracy in words
Sensitivity
The chance of testing positive among those with the condition
The chance of rejecting the null hypothesis among those that do not satisfy the null hypothesis
Specificity
The chance of testing negative among those without the condition
The chance of accepting the null hypothesis among those that satisfy the null hypothesis
Positive Predictive Value
The chance of having the condition among those that test positive
The chance of not satisfying the null hypothesis among those that reject the null hypothesis
Negative Predictive Value
The chance of not having the condition among those that test negative
The chance of satisfying the null hypothesis among those that accept the null hypothesis
Type I Error or α (alpha) or p-Value or false positive rate
The chance of testing positive among those without the condition
The chance of rejecting the null hypothesis among those that satisfy the null hypothesis
Type II Error or β (beta) or false negative rate
The chance of testing negative among those with the condition
The chance of accepting the null hypothesis among those that do not satisfy the null hypothesis
False Discovery Rate or q-Value
The chance of not having the condition among those that test positive
The chance of satisfying the null hypothesis among those that reject the null hypothesis
False Omission Rate
The chance of having the condition among those that test negative
The chance of not satisfying the null hypothesis among those that accept the null hypothesis
Rule-in AccuracyRule-in Accuracy
Depression
PRESENT
Depression
ABSENT
Test +ve True +ve False +ve
(type I error)
PPV
(discrimination)
Test -ve False –Ve
(type II error)
True -Ve NPV
Sensitivity
(occurrence)
Specificity Prevalence
Rule-Out AccuracyRule-Out Accuracy
Depression
PRESENT
Depression
ABSENT
Test +ve True +ve False +ve PPV
Test -ve False –Ve
(type II error)
True -Ve NPV
(discrimination)
Sensitivity Specificity
(occurrence)
Prevalence
Accuracy 2x2 TableAccuracy 2x2 Table
Depression
PRESENT
Depression
ABSENT
Test +ve True +ve False +ve PPV
Test -ve False -Ve True -Ve NPV
Sensitivity Specificity Prevalence
Test vs Major DepressionTest vs Major Depression
Depression
PRESENT
Depression
ABSENT
Test +ve 500 1500 2000
Test -ve 500 4500 5000
1000 6000 7000
Sensitivity
50%
PPV 25%
Specificity
75%
NPV 90%
Prevalence 14%
Test vs Major + Min DepressionTest vs Major + Min Depression
Depression
PRESENT
Depression
ABSENT
Test +ve 500 1500 2000
Test -ve 500 500 1000
1000 2000 3000
Sensitivity
50%
PPV 25%
Specificity
33%
NPV 50%
Prevalence 33%
T2. Advanced TechniquesT2. Advanced Techniques
Combined tests
Added Value
Cut-Offs
Prevalence adjustments
Summary MeasuresSummary Measures
Youden's J
Sensitivity + Specificity – 1
Predictive Summary Index
PPV + NPV – 1
Overall accuracy (fraction correct)
TP+TN / TP+FP+TN+FN
Added ValueAdded Value
Definition 1:
The additional ability of a test to rule‐in or rule‐out
compared with the baseline rate
PPV minus Prevalence
NPV minus prevalence
Definition 2:
The additional of a test to rule‐in or rule‐out compared
with the unassisted rate
PPV test minus PPV no test (assuming equal prevalence)
LR+ test minus LR+ no test
AUC test minus AUC no test
Reciprocal MeasuresReciprocal Measures
Number Needed to Diagnose (NND)
1 / (Youden's J)
Number Needed to Predict (NNP)
1 / (PSI)
Number Needed to Screen (NNS)
1/(FC‐FiC)
-0.10
0.00
0.10
0.20
0.30
0.40
0.50
Anger
Anxiety
Decreasedappetite
Decreasedweight
Depressedmood
Diminishedconcentration
DiminisheddriveDiminishedinterest/pleasure
Excessiveguilt
Helplessness
Hopelessness
Hypersomnia
Increasedappetite
Increasedweight
Indecisiveness
Insomnia
Lackofreactivemood
Lossofenergy
Psychicanxiety
Psychomotoragitation
Psychomotorchange
Psychomotorretardation
Sleepdisturbance
Somaticanxiety
Thoughtsofdeath
Worthlessness
Rule-In Added Value (PPV-Prev)
Rule-Out Added Value (NPV-Prev)
Accuracy of Tests: Visual Post-test ProbabilitiesAccuracy of Tests: Visual Post-test Probabilities
0% 100%25% 75%
Very unlikely Very likelylikelyunlikely
2 Questions
Overall
PHQ-2
WHO5 (1+3)
1 Question
3% - (37) - 63% = 60%
3% - (16) - 32% = 29%
3% - (16) - 32% = 29%
10% - (22) -50% = 54%
32% - (37) - 96% = 64%
Henckel et al (2004) Eur Arch Psychiatry Clin Neuros
CIDI (computer) Any Depression
Henckel et al (2004) Eur Arch Psychiatry Clin Neuros
CIDI (computer) Any Depression
Arroll B et al (2003) BMJ
CIDI (computer) Mj Depression
CIDI (computer) Mj Depression
Murphy JM, Berwick DM, Weinstein MC, Borus JF, Budman SH, Klerman GL 1987 : Performance of screening and
diagnostic tests: Application of Receiver Operating Characteristic ROC analysis. Arch Gen Psychiatry 44:550-555
Receiver Operating Characteristic
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Pre-test Probability
Post-testProbability
Depression Present (Routine)
Depression Absent (Routine)
Depression Scales +ve (Median)
Depression Scales -ve (Median)
Prior Probability
PPV=0.41
NPV=0. 97
Prevalence of 0.15
Group Work #1Group Work #1
930-10.00 – Introduction, groups and issues
10.00-11.00 – T1 Basic science of screening
Break
11.30 – 12.30 – Group task #1
Lunch
1.30-2.30 – T2 Symptoms, Burden, Help, Needs in Cancer
Break
3.00 – 4.00 – Evaluation of a screening paper
Cancer Mj Depression vs NonMjCancer Mj Depression vs NonMj
Clinicians diagnosis using DSMIV vs SCAN/PSE
50 people with depression
200 without depression
Clinicians using DSMIVClinicians using DSMIV
IF: Clinicians diagnosed 50 cases with depression
IF: Their specificity was 95%
Q. What was the sensitivity?
Q. What was the prevalence?
Q. What was the PPV?
Q. What was overall accuracy
Test vs Major DepressionTest vs Major Depression
Depression
On SCAN
Depression
ABSENT
Test +ve
(Clinician)
40 10 50
Test -ve 10 190
50 200
Sensitivity
80%
PPV 80%
Specificity
95%
NPV 95%
Prevalence 0.20%
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Pre-test Probability
Post-testProbability
NH NAs+
NH NAs-
Baseline Probability
Cancer Mj+Mn Depression vs NonCancer Mj+Mn Depression vs Non
Clinicians diagnosis using DSMIV vs SCAN/PSE
50 people with depression
200 without depression => 50 had minor depression
=> Answer 2=> Answer 2
Test vs Major DepressionTest vs Major Depression
Depression
On SCAN
Depression
ABSENT
Test +ve
(Clinician)
50 0 50
Test -ve 50 150 200
100 150
Sensitivity
50%
SN-OUT
PPV 100%
Specificity
100%
SP-IN
NPV 40%
Prevalence 66.7%
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Pre-test Probability
Post-testProbability
NH NAs+
NH NAs-
Baseline Probability
Likelihood RatiosLikelihood Ratios
Likelihood Ratio for Positive Tests
The chance of testing positive among
those with the condition; divided by the
chance of testing positive among those
without the condition
Sensitivity / (1 - Specificity)
[ TP / (TP + FN) ] / [ FP / (FP + TN) ]
= PPV / Prevalence
Likelihood Ratio for Negative Tests
The chance of testing negative among
those with the condition; divided by the
chance of testing negative among those
without the condition
Specificity / (1 – Sensitivity)
[ FN / (FN + TP) ] / [ TN / (TN + FP) ]
= NPV / Prevalence
T3. Symptoms, Help, Needs in CancerT3. Symptoms, Help, Needs in Cancer
Clinician Opinion
Patient Opinion
Psychosocial
Complications
Help
Seeking
Symptoms
Recognized
Intervention
Offered
Help
Accepted
Complication
Resolves
Lag
time
Lag
time
Lag
time
Lag
time
Lag
time
years months weeks weeks days
Cancer
Onset
Cancer
Progress
Lessons?
462 (42%)
Meetable Needs
1093 (100%)
Population
388 (84%)
Aware of Need
172 (44%)
Requested Help
80 (47%)
Needs Met
462 needs
17.3%
322 DSMIV
25%
T4. How Common is Distress?T4. How Common is Distress?
Clinician Opinion
Patient Opinion
Requires depressed mood for
most of the day, for most days
(by subjective account or
observation) for at least 2 years
The symptoms cause clinically
significant distress OR
impairment in social,
occupational, or other
important areas of functioning.
Requires persistently low mood two
(or more) of the following six
symptoms:
(1) poor appetite or overeating
(2) Insomnia or hypersomnia
(3) low energy or fatigue
(4) low self-esteem
(5) poor concentration or difficulty
making decisions
(6) feelings of hopelessness
DSM-IV Dysthymic disorder
Acute: if the disturbance lasts
less than 6 months
Chronic: if the disturbance
lasts for 6 months
These symptoms cause marked
distress that is in excess of
what would be expected from
exposure to the stressor OR
significant impairment in social
or occupational (academic)
functioning
Requires the development of
emotional or behavioral symptoms in
response to an identifiable stressor(s)
occurring within 3 months of the
onset of the stressor(s). Once the
stressor has terminated, the
symptoms do not persist for more
than an additional 6 months.
DSM-IV Adjustment disorder
2 weeksThese symptoms cause
clinically important distress OR
impair work, social or personal
functioning.
Requires two to four out of nine
symptoms with at least at least one
from the first two (depressed mood
and loss of interest).
DSM-IV Minor Depressive Disorder
2 weeksThese symptoms cause
clinically important distress OR
impair work, social or personal
functioning.
Requires five or more out of nine
symptoms with at least at least one
from the first two (depressed mood
and loss of interest).
DSM-IV Major Depressive Disorder
2 weeks unless symptoms are
unusually severe or of rapid
onset).
At least some difficulty in
continuing with ordinary work
and social activities
Requires two of the first three
symptoms (depressed mood, loss of
interest in everyday activities,
reduction in energy) plus at least two
of the remaining seven symptoms
(minimum of four symptoms)
ICD-10 Depressive Episode
DurationClinical SignificanceSymptoms
Depression
13%
20%
57%
48%
38%
18%
Anxiety
Adjustment Disorder
N=11
N=4
N=10
Comment: Slide illustrates meta-analytic
rates of mood disorder
Prevalence of depression in Palliative settings
20 studies involving 2655 individuals
16.9% (95% CI = 13.2% to 21.0%)
13.0% (95% CI = 11.6% to 14.5%) for MDD
p572
Proportion meta-analysis plot [random effects]
0.0 0.2 0.4 0.6
combined 0.17 (0.13, 0.21)
Maguire et al (1999) 0.05 (0.01, 0.14)
Akechi et al (2004) 0.07 (0.04, 0.11)
Kadan-Lottich et al (2005) 0.07 (0.04, 0.11)
Love et al (2004) 0.07 (0.04, 0.11)
Wilson et al (2004) 0.12 (0.05, 0.22)
Chochinov et al (1997) 0.12 (0.08, 0.18)
Wilson et al (2007) 0.13 (0.10, 0.17)
Kelly et al (2004) 0.14 (0.06, 0.26)
Chochinov et al (1994) 0.17 (0.11, 0.24)
Le Fevre et al (1999) 0.18 (0.10, 0.28)
Breitbart et al (2000) 0.18 (0.11, 0.28)
Meyer et al (2003) 0.20 (0.10, 0.35)
Minagawa et al (1996) 0.20 (0.11, 0.34)
Lloyd-Williams et al (2001) 0.22 (0.14, 0.31)
Hopwood et al (1991) 0.25 (0.16, 0.36)
Desai et al (1999) [late] 0.25 (0.10, 0.47)
Payne et al (2007) 0.26 (0.19, 0.33)
Lloyd-Williams et al (2003) 0.27 (0.17, 0.39)
Jen et al (2006) 0.27 (0.19, 0.36)
Lloyd-Williams et al (2007) 0.30 (0.24, 0.36)
proportion (95% confidence interval)
Prevalence of depression in Oncology settings
57 studies involving 9195 individuals across 12
countries.
The prevalence of depression was 17.3% (95% CI =
13.8% to 21.2%),
13.0% (95% CI = 11.6% to 14.5%) for MDD
p572
Proportion meta-analysis plot [random effects]
0.0 0.3 0.6 0.9
combined 0.1730 (0.1375, 0.2116)
Colon et al (1991) 0.0100 (0.0003, 0.0545)
Massie and Holland (1987) 0.0147 (0.0063, 0.0287)
Hardman et al (1989) 0.0317 (0.0087, 0.0793)
Derogatis et al (1983) 0.0372 (0.0162, 0.0720)
Lansky et al (1985) 0.0455 (0.0291, 0.0676)
Mehnert et al (2007) 0.0472 (0.0175, 0.1000)
Katz et al (2004) 0.0500 (0.0104, 0.1392)
Singer et al (2008) 0.0519 (0.0300, 0.0830)
Sneeuw et al (1994) 0.0540 (0.0367, 0.0761)
Pasacreta et al (1997) 0.0633 (0.0209, 0.1416)
Lee et al (1992) 0.0660 (0.0356, 0.1102)
Reuter and Hart (2001) 0.0761 (0.0422, 0.1244)
Grassi et al (2009) 0.0826 (0.0385, 0.1510)
Grassi et al (1993) 0.0828 (0.0448, 0.1374)
Walker et al (2007) 0.0831 (0.0568, 0.1165)
Kawase et al (2006) 0.0851 (0.0553, 0.1240)
Coyne et al (2004) 0.0885 (0.0433, 0.1567)
Alexander et al (2010) 0.0900 (0.0542, 0.1385)
Love et al (2002) 0.0957 (0.0650, 0.1346)
Ozalp et al (2008) 0.0971 (0.0576, 0.1510)
Morasso et al (2001) 0.0985 (0.0535, 0.1625)
Costantini et al (1999) 0.0985 (0.0535, 0.1625)
Silberfarb et al (1980) 0.1027 (0.0587, 0.1638)
Desai et al (1999) [early] 0.1111 (0.0371, 0.2405)
Morasso et al (1996) 0.1121 (0.0593, 0.1877)
Prieto et al (2002) 0.1227 (0.0825, 0.1735)
Ibbotson et al (1994) 0.1242 (0.0776, 0.1853)
Payne et al (1999) 0.1290 (0.0363, 0.2983)
Kugaya et al (1998) 0.1328 (0.0793, 0.2041)
Alexander et al (1993) 0.1333 (0.0594, 0.2459)
Gandubert et al (2009) 0.1597 (0.1040, 0.2300)
Razavi et al (1990) 0.1667 (0.1189, 0.2241)
Akizuki et al (2005) 0.1797 (0.1376, 0.2283)
Leopold et al (1998) 0.1887 (0.0944, 0.3197)
Devlen et al (1987) 0.1889 (0.1141, 0.2851)
Berard et al (1998) 0.1900 (0.1184, 0.2807)
Joffe et al (1986) 0.1905 (0.0545, 0.4191)
Berard et al (1998) 0.2100 (0.1349, 0.3029)
Maunsell et al (1992) 0.2146 (0.1605, 0.2772)
Grandi et al (1987) 0.2222 (0.0641, 0.4764)
Evans et al (1986) 0.2289 (0.1438, 0.3342)
Spiegel et al (1984) 0.2292 (0.1495, 0.3261)
Golden et al (1991) 0.2308 (0.1353, 0.3519)
Fallowfield et al (1990) 0.2565 (0.2054, 0.3131)
Hosaka and Aoki (1996) 0.2800 (0.1623, 0.4249)
Kathol et al (1990) 0.2961 (0.2248, 0.3754)
Green et al (1998) 0.3125 (0.2417, 0.3904)
Jenkins et al (1991) 0.3182 (0.1386, 0.5487)
Burgess et al (2005) 0.3317 (0.2672, 0.4012)
Hall et al (1999) 0.3722 (0.3139, 0.4333)
Morton et al (1984) 0.3958 (0.2577, 0.5473)
Baile et al (1992) 0.4000 (0.2570, 0.5567)
Passik et al (2001) 0.4167 (0.2907, 0.5512)
Bukberg et al (1984) 0.4194 (0.2951, 0.5515)
Massie et al (1979) 0.4850 (0.4303, 0.5401)
Ciaramella and Poli (2001) 0.4900 (0.3886, 0.5920)
Levine et al (1978) 0.5600 (0.4572, 0.6592)
Plumb & Holland (1981) 0.7750 (0.6679, 0.8609)
proportion (95% confidence interval)
Distress Thermometer
Distress Thermometer – Pooled Table
Score
Ransom
2006
Tuinman
2008
Mitchell
2009
Lord
2010
Hoffman
2004
Gessler
2009
Clover
2009
Jacobsen
2005 Sum
Proporti
on
Zero 68 38 61 123 14 27 65 71 467 18.4%
One 72 31 42 68 5 26 39 46 329 12.9%
Two 77 22 35 44 5 18 30 54 285 11.2%
Three 65 37 42 46 8 23 45 46 312 12.3%
Four 51 29 29 30 8 7 21 31 206 8.1%
Five 41 46 62 40 11 13 41 48 302 11.9%
Six 38 32 23 28 2 16 26 31 196 7.7%
Seven 36 21 23 38 2 15 32 16 183 7.2%
Eight 18 12 18 29 6 9 19 15 126 5.0%
Nine 16 5 8 14 3 3 13 9 71 2.8%
Ten 9 4 7 20 4 0 9 13 66 2.6%
Sum 491 277 350 480 68 157 340 380 2543
Proportion 19.3% 10.9% 13.8% 18.9% 2.7% 6.2% 13.4% 14.9%
Proportion
18 .4 %
12 .9 %
11.2 %
12 .3 %
8 .1%
11.9 %
5.0 %
2 .8 % 2 .6 %
7.7%
7.2 %
0.0%
2.0%
4.0%
6.0%
8.0%
10.0%
12.0%
14.0%
16.0%
18.0%
20.0%
Zero One Two Three Four Five Six Seven Eight Nine Ten
Insignificant SevereModerateMildMinimal
p124
50%
T5. Getting HelpT5. Getting Help
Clinician Opinion
Patient Opinion
Arrol et al (2005) BMJArrol et al (2005) BMJ
Setting 19 general practitioners in six clinics in New
Zealand. Participants 1025 consecutive patients
receiving no psychotropic drugs.
After screening “is this something you would like help
with?
The help question alone had a sensitivity of 75% and a
specificity of 94%
The general practitioner with PHQ2 diagnosis had a
sensitivity of 79% and a specificity of 94%
Arrol (2005) – Mj DepressionArrol (2005) – Mj Depression
47 CIDI cases with Major depression
25 (53%) wanted help
10 (21%) wanted the option of help
12 (25%) did not want help
Arrol (2005) – No DepressionArrol (2005) – No Depression
889 CIDI cases with Major depression
27 (3%) wanted help
24 (3%) wanted the option of help
838 (94%) did not want help
2x2 Help Table2x2 Help Table
Clinician thinks:
Help Needed
Clinician thinks:
Help Not Needed
Patient Says:
Help Wanted
=> Intervention => Refuse?
Patient Says:
Help Not Wanted
=> Delay =>Agree discharge
MethodologyMethodology
Study I: Baker-Glen, Symonds, Granger “ET Validation”
(a) n=129 chemotherapy attendees
(b) n=86 chemotherapy f/u
Study II: Sampson, Symonds, Granger “ET Extension”
(c) n=250 chemotherapy + late
Study III: Lord, Symonds, Granger “Coping”
(d) n=250
Study IV: Mitchell, Symonds, Steward “SMI RCT”
(e) n=300
Help – Who Wants Help?Help – Who Wants Help?
20% said they wanted professional help for psychosocial
issues.
Only 36% of those distressed on the DT wanted help.
Help – Do They Need It?Help – Do They Need It?
27% had major depression
62% had major or minor depression
88% had some distress (HADS, PHQ, DT)
Are Those Not Wanting Help OK?Are Those Not Wanting Help OK?
41/104 (39%) of decliners had no identifiable condition
=> 61% of those refusing help actually have a potentially
serious psychosocial condition.
What Kind of Help is Wanted?What Kind of Help is Wanted?
19% wanted medication (eg antidepressants)
31% want self help guidelines
31% wanted group therapy
56% wanted illness information.
58% complementary therapies
62% face-to-face psychological support
Help – Who From?Help – Who From?
Nurse specialists (54%)
Family and friends (21%)
Spiritual advisor (8%)
Psychiatrist (4%).
Why Not Needed?Why Not Needed?
“getting help elsewhere” (57%)
“feel well” (41%)
“coping on my own” (31%)
“fear of stigma”, “fear of side effects”, “not likely to be
effective for me”, and “don’t like to talk about
problems” (all less than 10%)
4. Is Help a Predictor?4. Is Help a Predictor?
Help as a Predictor of Depression?Help as a Predictor of Depression?
Outcome Predictor Sensitivity Specificity PPV NPV
DSMIV Major
Depression
Help QQ Alone 0.47 0.83 0.27 0.92
DSMIV Mj + Minor
Depression
Help QQ Alone 0.36 0.88 0.39 0.86
DSMIV Mj + Minor
Depression
Help QQ AND PHQ2 0.36 0.99 0.88 0.88
Can This Be Used Clinically?Can This Be Used Clinically?

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Science of Screening Tools

  • 1. Alex Mitchell www.psycho-oncology.info Department of Cancer & Molecular Medicine, Leicester Royal Infirmary Department of Liaison Psychiatry, Leicester General Hospital Portugal 2010Portugal 2010 WORKSHOP Day 1 Science of Screening: Definitions, analysis, screening tools, case-finding tools, prevalence, link with physical concerns WORKSHOP Day 1 Science of Screening: Definitions, analysis, screening tools, case-finding tools, prevalence, link with physical concerns
  • 2. Schedule Day 1Schedule Day 1 930-10.00 – Introduction, groups and issues 10.00-11.00 – T1 Basic science of screening Break 11.30 – 12.30 – Group task #1 Lunch 1.30-2.30 – T2 Symptoms, Burden, Help, Needs in Cancer Break 3.00 – 4.00 – Evaluation of a screening paper
  • 3. 10 Questions10 Questions 1. How do we understand screening studies 2. Can we design a screening study 3. Which instrument works best 4. Which is the most popular tool 5. How good are clinicians alone 6. Can the DT be improved 7. Is screening effective in clinical practice 8. What are the barriers to successful implementation 9. How can screening be improved 10. Do somatic symptoms interfere with the diagnosis
  • 4. Incidence > Prevalence > SuvivorshipIncidence > Prevalence > Suvivorship Changing landscape of epidemiology
  • 5. 10.9million incident cases (1mi breast, lung colorectal); 25mi prevalent cases
  • 6. 23 3 3 3 4 5 8 10 10 14 16 25 2 3 4 5 3 1 3 14 24 15 UK Rank (12th) (10th) (5th) (4th) (6th) (15th) (8th) (3rd) (1st) (2nd) All others Lip, oral cavity Leukaemia NHL Bladder Oesophagus Liver Stomach Colorectum Prostate Lung world (%) uk (%) 27 3 3 4 4 5 6 9 9 9 23 27 3 1 5 1 5 2 12 2 12 31 UK Rank (7th) (18th) (5th) (19th) (4th) (13th) (3rd) (11th) (2nd) (1st) All others NHL Thyroid Ovary Liver Uterus Stomach Lung Cervix Colorectum Breast world(%) uk(%) Males Most commonly diagnosed cancers worldwide Females
  • 7. Cancer Death Rates* Among Men, US,1930-2005 *Age-adjusted to the 2000 US standard population. Source: US Mortality Data 1960-2005, US Mortality Volumes 1930-1959, National Center for Health Statistics, Centers for Disease Control and Prevention, 2008. 0 20 40 60 80 100 1930 1935 1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 Lung & bronchus Colon & rectum Stomach Rate Per 100,000 Prostate Pancreas LiverLeukemia
  • 8. Cancer Death Rates* Among Women, US,1930-2005 *Age-adjusted to the 2000 US standard population. Source: US Mortality Data 1960-2005, US Mortality Volumes 1930-1959, National Center for Health Statistics, Centers for Disease Control and Prevention, 2008. 0 20 40 60 80 100 1930 1935 1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 Lung & bronchus Colon & rectum Uterus Stomach Breast Ovary Pancreas Rate Per 100,000
  • 10. Distress Thermometer – Pooled Proportion 18 .4 % 12 .9 % 11.2 % 12 .3 % 8 .1% 11.9 % 5.0 % 2 .8 % 2 .6 % 7.7% 7.2 % 0.0% 2.0% 4.0% 6.0% 8.0% 10.0% 12.0% 14.0% 16.0% 18.0% 20.0% Zero One Two Three Four Five Six Seven Eight Nine Ten Insignificant SevereModerateMildMinimal p124 50%
  • 11. 94.2% 37.4% 8 yrs N= 9282 NCS‐R
  • 12. N=23 studies; 50% some treatment 33% minimal treatment N=19 studies; 30% 1 in 1/12; 10% 3 in 3 months
  • 13. T1. Basic Science of ScreeningT1. Basic Science of Screening Definitions Graphics
  • 14. Diagnostic Testing……by application (who)Diagnostic Testing……by application (who) Routine Screening The systematic application of a test or inquiry, to all individuals who may have (or who have not sought medical help for that disorder) Targeted (High Risk) The highly selected application of a test or inquiry, to identify individuals at high risk of a specific disorder by virtue of known risk factors Adapted from Department of Health. Annual report of the national screening committee. London: DoH, 1997.
  • 15. Diagnostic Testing……by aim (why)Diagnostic Testing……by aim (why) Screening Rule out those without the disorder with high accuracy (high NPV) Case-Finding Rule in those with the disorder with high accuracy (high PPV)
  • 16. Diagnostic Testing……by method (how)Diagnostic Testing……by method (how) Screening A simple tool with high acceptability but good NPV Case-Finding An accurate tool with high PPV and NPV Rating Simple, patient rated, correl. With QoL and other outcomes
  • 17. Defining Diagnostic Testing…by comparatorDefining Diagnostic Testing…by comparator Accuracy (aka convergent validity) The degree of approximation (veracity) to a robust comparator Validity (aka criterion validity) The degree of approximation (veracity) to a criterion reference Precision The degree of predictability (low SD) in the measure
  • 18. Stage Type Purpose Description Pre-clinical Development Development of the proposed tool or test Here the aim is to develop a screening method that is likely to help in the detection of the underlying disorder, either in a specific setting or in all setting. Issues of acceptability of the tool to both patients and staff must be considered in order for implementation to be successful. Phase I_screen Diagnostic validity Early diagnostic validity testing in a selected sample and refinement of tool The aim is to evaluate the early design of the screening method against a known (ideally accurate) standard known as the criterion reference. In early testing the tool may be refined, selecting most useful aspects and deleting redundant aspects in order to make the tool as efficient (brief) as possible whilst retaining its value. Phase II_screen Diagnostic validity Diagnostic validity in a representative sample The aim is to assess the refined tool against a criterion (gold standard) in a real world sample where the comparator subjects may comprise several competing condition which may otherwise cause difficulty regarding differential diagnosis. Phase III_screen Implementation Screening RCT; clinicians using vs not using a screening tool This is an important step in which the tool is evaluated clinically in one group with access to the new method compared to a second group (ideally selected in a randomized fashion) who make assessments without the tool. Phase IV_screen Implementation Screening implementation studies using real-world outcomes In this last step the screening tool /method is introduced clinically but monitored to discover the effect on important patient outcomes such as new identifications, new cases treated and new cases entering remission. Development of Diagnostic Tests
  • 19. Concepts: Se Sp PPV NPVConcepts: Se Sp PPV NPV
  • 20. Accuracy 2x2 TableAccuracy 2x2 Table Depression PRESENT Depression ABSENT Test +ve True +ve False +ve PPV Test ‐ve False ‐Ve True ‐Ve NPV Sensitivity Specificity Prevalence Reference Standard Disorder Present Reference Standard No Disorder Test +ve A B A/A + B PPV Test -ve C D D/C + D NPV Total A / A + C Sn D / B + D Sp
  • 21. Basic Measures of AccuracyBasic Measures of Accuracy Sensitivity (Se) a/(a + c) TP / (TP + FN) A measure of accuracy defined the proportion of patients with disease in whom the test result is positive: a/(a + c) Specificity (Sp) d/(b + d) TN / (TN + FP) A measure of accuracy defined as the proportion of patients without disease in whom the test result is negative Positive Predictive Value a/(a+b) TP / (TP + FP) A measure of rule‐in accuracy defined as the proportion of true positives in those that screen positive screening result, as follows Negative Predictive Value c/(c+d) TN / (TN + FN) A measure of rule‐out accuracy defined as the proportion of true negatives in those that screen negative screening result, as follows
  • 23. Graphical – Screening principles Non-Depressed Depressed # of Individuals # of Individuals Severity of Depression
  • 24. Graphical – Screening principles Non-Depressed Depressed # of Individuals Cut-Off # of Individuals Severity of Depression HighLow
  • 25. Graphical – Screening principles Non-Depressed Depressed # of Individuals Cut-Off # of Individuals Severity of Depression HighLow High Sensitivity >>>> <<<< high Specificity
  • 26. Graphical – Screening principles Non-Depressed Depressed # of Individuals Cut-Off # of Individuals Severity of Depression HighLow High Sensitivity >>>> <<<< low Specificity
  • 27. Can This Help establish a syndrome?Can This Help establish a syndrome?
  • 28. Example: A Clear Disease [#1]Example: A Clear Disease [#1] Disorder Number of Individuals False +veFalse +ve True -veTrue -ve Point of Partial Rarity Test Result No Disorder False -veFalse -ve True +veTrue +ve
  • 29. Example: A Probable Syndrome [#2]Example: A Probable Syndrome [#2] Disorder Number of Individuals False +veFalse +ve False -veFalse -ve True -veTrue -ve True +veTrue +ve MMSE Cognitive Score No Disorder
  • 30. Example: A Normally Distributed Trait [#3]Example: A Normally Distributed Trait [#3] Disorder Number of Individuals False +veFalse +ve False -veFalse -ve True -veTrue -ve True +veTrue +ve MMSE Cognitive Score No Disorder
  • 32. Hubbert et al (2005) BMC GeriatricsHubbert et al (2005) BMC Geriatrics MMSE scores for dementia (n=72) and non-dementia (n=2735) Huppert et al BMC Geriatrc 2005
  • 34. Thompson et al (2001) n=18,414 HADS-DThompson et al (2001) n=18,414 HADS-D 0 500 1000 1500 2000 2500 3000 Zero O ne Tw o Three Four Five Six Seven eight N ine Ten Eleven Tw elve Thirteen Fourteen Fifteen SixteenSeventeen Eighteen
  • 36. T1. Science ExamplesT1. Science Examples 2x2 tables workshop
  • 37. Accuracy in wordsAccuracy in words Sensitivity The chance of testing positive among those with the condition The chance of rejecting the null hypothesis among those that do not satisfy the null hypothesis Specificity The chance of testing negative among those without the condition The chance of accepting the null hypothesis among those that satisfy the null hypothesis Positive Predictive Value The chance of having the condition among those that test positive The chance of not satisfying the null hypothesis among those that reject the null hypothesis Negative Predictive Value The chance of not having the condition among those that test negative The chance of satisfying the null hypothesis among those that accept the null hypothesis Type I Error or α (alpha) or p-Value or false positive rate The chance of testing positive among those without the condition The chance of rejecting the null hypothesis among those that satisfy the null hypothesis Type II Error or β (beta) or false negative rate The chance of testing negative among those with the condition The chance of accepting the null hypothesis among those that do not satisfy the null hypothesis False Discovery Rate or q-Value The chance of not having the condition among those that test positive The chance of satisfying the null hypothesis among those that reject the null hypothesis False Omission Rate The chance of having the condition among those that test negative The chance of not satisfying the null hypothesis among those that accept the null hypothesis
  • 38. Rule-in AccuracyRule-in Accuracy Depression PRESENT Depression ABSENT Test +ve True +ve False +ve (type I error) PPV (discrimination) Test -ve False –Ve (type II error) True -Ve NPV Sensitivity (occurrence) Specificity Prevalence
  • 39. Rule-Out AccuracyRule-Out Accuracy Depression PRESENT Depression ABSENT Test +ve True +ve False +ve PPV Test -ve False –Ve (type II error) True -Ve NPV (discrimination) Sensitivity Specificity (occurrence) Prevalence
  • 40. Accuracy 2x2 TableAccuracy 2x2 Table Depression PRESENT Depression ABSENT Test +ve True +ve False +ve PPV Test -ve False -Ve True -Ve NPV Sensitivity Specificity Prevalence
  • 41. Test vs Major DepressionTest vs Major Depression Depression PRESENT Depression ABSENT Test +ve 500 1500 2000 Test -ve 500 4500 5000 1000 6000 7000 Sensitivity 50% PPV 25% Specificity 75% NPV 90% Prevalence 14%
  • 42. Test vs Major + Min DepressionTest vs Major + Min Depression Depression PRESENT Depression ABSENT Test +ve 500 1500 2000 Test -ve 500 500 1000 1000 2000 3000 Sensitivity 50% PPV 25% Specificity 33% NPV 50% Prevalence 33%
  • 43. T2. Advanced TechniquesT2. Advanced Techniques Combined tests Added Value Cut-Offs Prevalence adjustments
  • 44. Summary MeasuresSummary Measures Youden's J Sensitivity + Specificity – 1 Predictive Summary Index PPV + NPV – 1 Overall accuracy (fraction correct) TP+TN / TP+FP+TN+FN
  • 45. Added ValueAdded Value Definition 1: The additional ability of a test to rule‐in or rule‐out compared with the baseline rate PPV minus Prevalence NPV minus prevalence Definition 2: The additional of a test to rule‐in or rule‐out compared with the unassisted rate PPV test minus PPV no test (assuming equal prevalence) LR+ test minus LR+ no test AUC test minus AUC no test
  • 46. Reciprocal MeasuresReciprocal Measures Number Needed to Diagnose (NND) 1 / (Youden's J) Number Needed to Predict (NNP) 1 / (PSI) Number Needed to Screen (NNS) 1/(FC‐FiC)
  • 48. Accuracy of Tests: Visual Post-test ProbabilitiesAccuracy of Tests: Visual Post-test Probabilities 0% 100%25% 75% Very unlikely Very likelylikelyunlikely 2 Questions Overall PHQ-2 WHO5 (1+3) 1 Question 3% - (37) - 63% = 60% 3% - (16) - 32% = 29% 3% - (16) - 32% = 29% 10% - (22) -50% = 54% 32% - (37) - 96% = 64% Henckel et al (2004) Eur Arch Psychiatry Clin Neuros CIDI (computer) Any Depression Henckel et al (2004) Eur Arch Psychiatry Clin Neuros CIDI (computer) Any Depression Arroll B et al (2003) BMJ CIDI (computer) Mj Depression CIDI (computer) Mj Depression
  • 49. Murphy JM, Berwick DM, Weinstein MC, Borus JF, Budman SH, Klerman GL 1987 : Performance of screening and diagnostic tests: Application of Receiver Operating Characteristic ROC analysis. Arch Gen Psychiatry 44:550-555 Receiver Operating Characteristic
  • 50. 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Pre-test Probability Post-testProbability Depression Present (Routine) Depression Absent (Routine) Depression Scales +ve (Median) Depression Scales -ve (Median) Prior Probability PPV=0.41 NPV=0. 97 Prevalence of 0.15
  • 51. Group Work #1Group Work #1 930-10.00 – Introduction, groups and issues 10.00-11.00 – T1 Basic science of screening Break 11.30 – 12.30 – Group task #1 Lunch 1.30-2.30 – T2 Symptoms, Burden, Help, Needs in Cancer Break 3.00 – 4.00 – Evaluation of a screening paper
  • 52. Cancer Mj Depression vs NonMjCancer Mj Depression vs NonMj Clinicians diagnosis using DSMIV vs SCAN/PSE 50 people with depression 200 without depression
  • 53. Clinicians using DSMIVClinicians using DSMIV IF: Clinicians diagnosed 50 cases with depression IF: Their specificity was 95% Q. What was the sensitivity? Q. What was the prevalence? Q. What was the PPV? Q. What was overall accuracy
  • 54. Test vs Major DepressionTest vs Major Depression Depression On SCAN Depression ABSENT Test +ve (Clinician) 40 10 50 Test -ve 10 190 50 200 Sensitivity 80% PPV 80% Specificity 95% NPV 95% Prevalence 0.20%
  • 55. 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Pre-test Probability Post-testProbability NH NAs+ NH NAs- Baseline Probability
  • 56. Cancer Mj+Mn Depression vs NonCancer Mj+Mn Depression vs Non Clinicians diagnosis using DSMIV vs SCAN/PSE 50 people with depression 200 without depression => 50 had minor depression
  • 57. => Answer 2=> Answer 2
  • 58. Test vs Major DepressionTest vs Major Depression Depression On SCAN Depression ABSENT Test +ve (Clinician) 50 0 50 Test -ve 50 150 200 100 150 Sensitivity 50% SN-OUT PPV 100% Specificity 100% SP-IN NPV 40% Prevalence 66.7%
  • 59. 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Pre-test Probability Post-testProbability NH NAs+ NH NAs- Baseline Probability
  • 60. Likelihood RatiosLikelihood Ratios Likelihood Ratio for Positive Tests The chance of testing positive among those with the condition; divided by the chance of testing positive among those without the condition Sensitivity / (1 - Specificity) [ TP / (TP + FN) ] / [ FP / (FP + TN) ] = PPV / Prevalence Likelihood Ratio for Negative Tests The chance of testing negative among those with the condition; divided by the chance of testing negative among those without the condition Specificity / (1 – Sensitivity) [ FN / (FN + TP) ] / [ TN / (TN + FP) ] = NPV / Prevalence
  • 61. T3. Symptoms, Help, Needs in CancerT3. Symptoms, Help, Needs in Cancer Clinician Opinion Patient Opinion
  • 63. 462 (42%) Meetable Needs 1093 (100%) Population 388 (84%) Aware of Need 172 (44%) Requested Help 80 (47%) Needs Met 462 needs 17.3% 322 DSMIV 25%
  • 64. T4. How Common is Distress?T4. How Common is Distress? Clinician Opinion Patient Opinion
  • 65. Requires depressed mood for most of the day, for most days (by subjective account or observation) for at least 2 years The symptoms cause clinically significant distress OR impairment in social, occupational, or other important areas of functioning. Requires persistently low mood two (or more) of the following six symptoms: (1) poor appetite or overeating (2) Insomnia or hypersomnia (3) low energy or fatigue (4) low self-esteem (5) poor concentration or difficulty making decisions (6) feelings of hopelessness DSM-IV Dysthymic disorder Acute: if the disturbance lasts less than 6 months Chronic: if the disturbance lasts for 6 months These symptoms cause marked distress that is in excess of what would be expected from exposure to the stressor OR significant impairment in social or occupational (academic) functioning Requires the development of emotional or behavioral symptoms in response to an identifiable stressor(s) occurring within 3 months of the onset of the stressor(s). Once the stressor has terminated, the symptoms do not persist for more than an additional 6 months. DSM-IV Adjustment disorder 2 weeksThese symptoms cause clinically important distress OR impair work, social or personal functioning. Requires two to four out of nine symptoms with at least at least one from the first two (depressed mood and loss of interest). DSM-IV Minor Depressive Disorder 2 weeksThese symptoms cause clinically important distress OR impair work, social or personal functioning. Requires five or more out of nine symptoms with at least at least one from the first two (depressed mood and loss of interest). DSM-IV Major Depressive Disorder 2 weeks unless symptoms are unusually severe or of rapid onset). At least some difficulty in continuing with ordinary work and social activities Requires two of the first three symptoms (depressed mood, loss of interest in everyday activities, reduction in energy) plus at least two of the remaining seven symptoms (minimum of four symptoms) ICD-10 Depressive Episode DurationClinical SignificanceSymptoms
  • 67. Prevalence of depression in Palliative settings 20 studies involving 2655 individuals 16.9% (95% CI = 13.2% to 21.0%) 13.0% (95% CI = 11.6% to 14.5%) for MDD p572 Proportion meta-analysis plot [random effects] 0.0 0.2 0.4 0.6 combined 0.17 (0.13, 0.21) Maguire et al (1999) 0.05 (0.01, 0.14) Akechi et al (2004) 0.07 (0.04, 0.11) Kadan-Lottich et al (2005) 0.07 (0.04, 0.11) Love et al (2004) 0.07 (0.04, 0.11) Wilson et al (2004) 0.12 (0.05, 0.22) Chochinov et al (1997) 0.12 (0.08, 0.18) Wilson et al (2007) 0.13 (0.10, 0.17) Kelly et al (2004) 0.14 (0.06, 0.26) Chochinov et al (1994) 0.17 (0.11, 0.24) Le Fevre et al (1999) 0.18 (0.10, 0.28) Breitbart et al (2000) 0.18 (0.11, 0.28) Meyer et al (2003) 0.20 (0.10, 0.35) Minagawa et al (1996) 0.20 (0.11, 0.34) Lloyd-Williams et al (2001) 0.22 (0.14, 0.31) Hopwood et al (1991) 0.25 (0.16, 0.36) Desai et al (1999) [late] 0.25 (0.10, 0.47) Payne et al (2007) 0.26 (0.19, 0.33) Lloyd-Williams et al (2003) 0.27 (0.17, 0.39) Jen et al (2006) 0.27 (0.19, 0.36) Lloyd-Williams et al (2007) 0.30 (0.24, 0.36) proportion (95% confidence interval)
  • 68. Prevalence of depression in Oncology settings 57 studies involving 9195 individuals across 12 countries. The prevalence of depression was 17.3% (95% CI = 13.8% to 21.2%), 13.0% (95% CI = 11.6% to 14.5%) for MDD p572 Proportion meta-analysis plot [random effects] 0.0 0.3 0.6 0.9 combined 0.1730 (0.1375, 0.2116) Colon et al (1991) 0.0100 (0.0003, 0.0545) Massie and Holland (1987) 0.0147 (0.0063, 0.0287) Hardman et al (1989) 0.0317 (0.0087, 0.0793) Derogatis et al (1983) 0.0372 (0.0162, 0.0720) Lansky et al (1985) 0.0455 (0.0291, 0.0676) Mehnert et al (2007) 0.0472 (0.0175, 0.1000) Katz et al (2004) 0.0500 (0.0104, 0.1392) Singer et al (2008) 0.0519 (0.0300, 0.0830) Sneeuw et al (1994) 0.0540 (0.0367, 0.0761) Pasacreta et al (1997) 0.0633 (0.0209, 0.1416) Lee et al (1992) 0.0660 (0.0356, 0.1102) Reuter and Hart (2001) 0.0761 (0.0422, 0.1244) Grassi et al (2009) 0.0826 (0.0385, 0.1510) Grassi et al (1993) 0.0828 (0.0448, 0.1374) Walker et al (2007) 0.0831 (0.0568, 0.1165) Kawase et al (2006) 0.0851 (0.0553, 0.1240) Coyne et al (2004) 0.0885 (0.0433, 0.1567) Alexander et al (2010) 0.0900 (0.0542, 0.1385) Love et al (2002) 0.0957 (0.0650, 0.1346) Ozalp et al (2008) 0.0971 (0.0576, 0.1510) Morasso et al (2001) 0.0985 (0.0535, 0.1625) Costantini et al (1999) 0.0985 (0.0535, 0.1625) Silberfarb et al (1980) 0.1027 (0.0587, 0.1638) Desai et al (1999) [early] 0.1111 (0.0371, 0.2405) Morasso et al (1996) 0.1121 (0.0593, 0.1877) Prieto et al (2002) 0.1227 (0.0825, 0.1735) Ibbotson et al (1994) 0.1242 (0.0776, 0.1853) Payne et al (1999) 0.1290 (0.0363, 0.2983) Kugaya et al (1998) 0.1328 (0.0793, 0.2041) Alexander et al (1993) 0.1333 (0.0594, 0.2459) Gandubert et al (2009) 0.1597 (0.1040, 0.2300) Razavi et al (1990) 0.1667 (0.1189, 0.2241) Akizuki et al (2005) 0.1797 (0.1376, 0.2283) Leopold et al (1998) 0.1887 (0.0944, 0.3197) Devlen et al (1987) 0.1889 (0.1141, 0.2851) Berard et al (1998) 0.1900 (0.1184, 0.2807) Joffe et al (1986) 0.1905 (0.0545, 0.4191) Berard et al (1998) 0.2100 (0.1349, 0.3029) Maunsell et al (1992) 0.2146 (0.1605, 0.2772) Grandi et al (1987) 0.2222 (0.0641, 0.4764) Evans et al (1986) 0.2289 (0.1438, 0.3342) Spiegel et al (1984) 0.2292 (0.1495, 0.3261) Golden et al (1991) 0.2308 (0.1353, 0.3519) Fallowfield et al (1990) 0.2565 (0.2054, 0.3131) Hosaka and Aoki (1996) 0.2800 (0.1623, 0.4249) Kathol et al (1990) 0.2961 (0.2248, 0.3754) Green et al (1998) 0.3125 (0.2417, 0.3904) Jenkins et al (1991) 0.3182 (0.1386, 0.5487) Burgess et al (2005) 0.3317 (0.2672, 0.4012) Hall et al (1999) 0.3722 (0.3139, 0.4333) Morton et al (1984) 0.3958 (0.2577, 0.5473) Baile et al (1992) 0.4000 (0.2570, 0.5567) Passik et al (2001) 0.4167 (0.2907, 0.5512) Bukberg et al (1984) 0.4194 (0.2951, 0.5515) Massie et al (1979) 0.4850 (0.4303, 0.5401) Ciaramella and Poli (2001) 0.4900 (0.3886, 0.5920) Levine et al (1978) 0.5600 (0.4572, 0.6592) Plumb & Holland (1981) 0.7750 (0.6679, 0.8609) proportion (95% confidence interval)
  • 70. Distress Thermometer – Pooled Table Score Ransom 2006 Tuinman 2008 Mitchell 2009 Lord 2010 Hoffman 2004 Gessler 2009 Clover 2009 Jacobsen 2005 Sum Proporti on Zero 68 38 61 123 14 27 65 71 467 18.4% One 72 31 42 68 5 26 39 46 329 12.9% Two 77 22 35 44 5 18 30 54 285 11.2% Three 65 37 42 46 8 23 45 46 312 12.3% Four 51 29 29 30 8 7 21 31 206 8.1% Five 41 46 62 40 11 13 41 48 302 11.9% Six 38 32 23 28 2 16 26 31 196 7.7% Seven 36 21 23 38 2 15 32 16 183 7.2% Eight 18 12 18 29 6 9 19 15 126 5.0% Nine 16 5 8 14 3 3 13 9 71 2.8% Ten 9 4 7 20 4 0 9 13 66 2.6% Sum 491 277 350 480 68 157 340 380 2543 Proportion 19.3% 10.9% 13.8% 18.9% 2.7% 6.2% 13.4% 14.9%
  • 71. Proportion 18 .4 % 12 .9 % 11.2 % 12 .3 % 8 .1% 11.9 % 5.0 % 2 .8 % 2 .6 % 7.7% 7.2 % 0.0% 2.0% 4.0% 6.0% 8.0% 10.0% 12.0% 14.0% 16.0% 18.0% 20.0% Zero One Two Three Four Five Six Seven Eight Nine Ten Insignificant SevereModerateMildMinimal p124 50%
  • 72. T5. Getting HelpT5. Getting Help Clinician Opinion Patient Opinion
  • 73.
  • 74. Arrol et al (2005) BMJArrol et al (2005) BMJ Setting 19 general practitioners in six clinics in New Zealand. Participants 1025 consecutive patients receiving no psychotropic drugs. After screening “is this something you would like help with? The help question alone had a sensitivity of 75% and a specificity of 94% The general practitioner with PHQ2 diagnosis had a sensitivity of 79% and a specificity of 94%
  • 75. Arrol (2005) – Mj DepressionArrol (2005) – Mj Depression 47 CIDI cases with Major depression 25 (53%) wanted help 10 (21%) wanted the option of help 12 (25%) did not want help
  • 76. Arrol (2005) – No DepressionArrol (2005) – No Depression 889 CIDI cases with Major depression 27 (3%) wanted help 24 (3%) wanted the option of help 838 (94%) did not want help
  • 77. 2x2 Help Table2x2 Help Table Clinician thinks: Help Needed Clinician thinks: Help Not Needed Patient Says: Help Wanted => Intervention => Refuse? Patient Says: Help Not Wanted => Delay =>Agree discharge
  • 78. MethodologyMethodology Study I: Baker-Glen, Symonds, Granger “ET Validation” (a) n=129 chemotherapy attendees (b) n=86 chemotherapy f/u Study II: Sampson, Symonds, Granger “ET Extension” (c) n=250 chemotherapy + late Study III: Lord, Symonds, Granger “Coping” (d) n=250 Study IV: Mitchell, Symonds, Steward “SMI RCT” (e) n=300
  • 79.
  • 80.
  • 81. Help – Who Wants Help?Help – Who Wants Help? 20% said they wanted professional help for psychosocial issues. Only 36% of those distressed on the DT wanted help.
  • 82. Help – Do They Need It?Help – Do They Need It? 27% had major depression 62% had major or minor depression 88% had some distress (HADS, PHQ, DT)
  • 83. Are Those Not Wanting Help OK?Are Those Not Wanting Help OK? 41/104 (39%) of decliners had no identifiable condition => 61% of those refusing help actually have a potentially serious psychosocial condition.
  • 84. What Kind of Help is Wanted?What Kind of Help is Wanted? 19% wanted medication (eg antidepressants) 31% want self help guidelines 31% wanted group therapy 56% wanted illness information. 58% complementary therapies 62% face-to-face psychological support
  • 85. Help – Who From?Help – Who From? Nurse specialists (54%) Family and friends (21%) Spiritual advisor (8%) Psychiatrist (4%).
  • 86. Why Not Needed?Why Not Needed? “getting help elsewhere” (57%) “feel well” (41%) “coping on my own” (31%) “fear of stigma”, “fear of side effects”, “not likely to be effective for me”, and “don’t like to talk about problems” (all less than 10%)
  • 87. 4. Is Help a Predictor?4. Is Help a Predictor?
  • 88. Help as a Predictor of Depression?Help as a Predictor of Depression? Outcome Predictor Sensitivity Specificity PPV NPV DSMIV Major Depression Help QQ Alone 0.47 0.83 0.27 0.92 DSMIV Mj + Minor Depression Help QQ Alone 0.36 0.88 0.39 0.86 DSMIV Mj + Minor Depression Help QQ AND PHQ2 0.36 0.99 0.88 0.88
  • 89. Can This Be Used Clinically?Can This Be Used Clinically?