This document discusses various epidemiological study designs. It begins by defining descriptive studies, which involve systematically collecting and presenting data to describe a situation, and analytical studies, which attempt to establish causes or risk factors by comparing exposed and unexposed groups. The main types of descriptive studies covered are cross-sectional (examining a population at a single point in time), longitudinal (following a population over time), and ecological (examining population-level associations between exposures and outcomes). Advantages and disadvantages of each design are provided.
Study designs, Epidemiological study design, Types of studiesDr Lipilekha Patnaik
Study design, Epidemiological study designA study design is a specific plan or protocol
for conducting the study, which allows the investigator to translate the conceptual hypothesis into an operational one.
Disease screening and screening test validityTampiwaChebani
Full lecture covering screening tests and validity testing. Covers topics such as calculation and interpretation of sensitivity, specificity, positive predictive value and negative predictive value of a screening test.
Introduction to Epidemiology
At the end of this session the participants will be able to:
Discuss the historical evolution of epidemiology
Explain the usage of epidemiology
List the core epidemiological functions
Explain types of epidemiological studies
Study designs, Epidemiological study design, Types of studiesDr Lipilekha Patnaik
Study design, Epidemiological study designA study design is a specific plan or protocol
for conducting the study, which allows the investigator to translate the conceptual hypothesis into an operational one.
Disease screening and screening test validityTampiwaChebani
Full lecture covering screening tests and validity testing. Covers topics such as calculation and interpretation of sensitivity, specificity, positive predictive value and negative predictive value of a screening test.
Introduction to Epidemiology
At the end of this session the participants will be able to:
Discuss the historical evolution of epidemiology
Explain the usage of epidemiology
List the core epidemiological functions
Explain types of epidemiological studies
Social and Preventive Medicine Classroom discussion topic on types of Epidemiological study designs available.
sole reference is Park text book 20th edition
Observingthedistributionofdiseaseorhealth related events in human population.
• Identify the characteristics with which the disease is associated.
• Basically 3 questions are asked who, when and where.
• Who means the person affected, where means the place and when is the time distribution.
Social and Preventive Medicine Classroom discussion topic on types of Epidemiological study designs available.
sole reference is Park text book 20th edition
Observingthedistributionofdiseaseorhealth related events in human population.
• Identify the characteristics with which the disease is associated.
• Basically 3 questions are asked who, when and where.
• Who means the person affected, where means the place and when is the time distribution.
ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
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TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
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Microteaching is a unique model of practice teaching. It is a viable instrument for the. desired change in the teaching behavior or the behavior potential which, in specified types of real. classroom situations, tends to facilitate the achievement of specified types of objectives.
These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
Pulmonary Thromboembolism - etilogy, types, medical- Surgical and nursing man...VarunMahajani
Disruption of blood supply to lung alveoli due to blockage of one or more pulmonary blood vessels is called as Pulmonary thromboembolism. In this presentation we will discuss its causes, types and its management in depth.
Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
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Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
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Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
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2. objectives
• Identify basic study designs used in epidemiology
studies.
• Understand the concept of descriptive
epidemiological studies.
• Understand the concepts of exposure, outcome and
risk.
• Identify the association between exposure and
outcome.
3.
4.
5. introduction
Study design is the arrangement of
conditions for the collection and analysis of
data to provide the most accurate answer to
a question in the most economical way.
Epidemiological study design directs how
investigation is conducted .
Epidemiological studies can be classified
into descriptive and analytical study designs
.
6. Descriptive and analytical study
designs
Descriptive studies involve the systematic collection and
presentation of data to give a clear picture of a particular
situation and can be carried out on a small or large scale.
Descriptive study is used to describes Disease occurrence
in a population e.g.
Incidence
Prevalence
Survival
ANALYTICAL STUDIES
An Analytical Study attempts to establish causes or risk factors
for certain problems. This is done by comparing two or more
groups, some of which have or develop the problem and some
of which have not.
Analytical studies is used to determine etiology of disease
11. Descriptive Study
Descriptive study is concerned with the following questions:
a. When is the disease occurring (Time)
b. Where it is occurring (Place)
c. Who is getting the disease (Person)
Descriptive study include:
• Case studies
• Case series
• Ecological /correlation
• Cross sectional
• Longitudinal
12. Uses of descriptive study
Provides data regarding
• The magnitude of the disease load
• The types of disease problem in the community in term of morbidity
and mortality rate and ratio
Provides “clues” to the disease etiology
Helps in
• Formulation of etiological hypothesis
Helps in planning, implementation and evaluation of health
services/programmes
13. Procedures of descriptive study
1.Defining the population to be studied
• Descriptive study are investigation of population not
individual; include total number
• Sex
• Age
• Occupation
• cultural
2. Defining the disease under study
• Specified the disease to be investigated
• The main objective to obtain accurate estimate of disease
in a population
14. 3.Describing the disease .
• The main primary objective of descriptive epidemiology is
to describe the occurrence and distribution of disease by
• Time
• Place
• Person
4. Measurement of the disease
• Cross Sectional Study
• Longitudinal Study
• The information should be available in terms of
• Mortality
• Morbidity (incidence and prevalence)
• distribution
15. 5.Comparing with known indices
Making comparisons between different population, this is to
identify groups who are at risk for certain diseases
6. Formulation of an etiological hypothesis
Hypothesis should formulated in a manner that that it can
be tested
• Hypothesis should specify the following
• -the population- the characteristics of the persons to
whom the hypothesis to be applied
• -the specific cause being considered
• -the expected outcome
• -the dose-response relationship
• -the time-response relationship (time between exposure
to the cause observed)
16. Analyses of descriptive study
• •Data checked for any errors and outliers prior to
analysis.
• •Data explored graphically e.g. plot the frequency
distributions of various variables
• –Check normality of the distribution
• •Standard descriptive statistics
• –Mean, median, quartiles, mode
• –Range, interquartile range, standard deviation
• –Standard error and confidence intervals
• –Prevalence rates
17. (cont.) Analysis of descriptive study
studies
•Association can be explored using correlation and
regression for continuous variables
• –Shows variables are associated, not necessarily
imply a cause and effect relationship.
•Means can be compared
•Complex multivariate analysis (multiple and
logistics regression) can be carried out
• to investigate how a dependent variable is related
to more than one explanatory variable.
18. Cross sectional studies
• Based on a single examination of a cross section
of population at one point in time, results of
which can be projected on the whole population
provided the sampling has been done correctly.
• In this study design information about the status
of an individual with respect to presence/absence
of exposure and diseased is assessed at a point in
time.
• Cross-sectional studies are useful to generate a
hypothesis rather that to test it
• For factors that remain unaltered overtime
(e.g. sex, race, blood group) it can produce a valid
association
19. Uses of cross-sectional study
a. More useful in chronic diseases
b. To find more about disease rather than its etiology
• Prevalence
• Disease outbreaks
• Trends in diseases (repeated c/s studies)
• Risk factors for diseases (e.g., NCDs)
c. Assessing healthcare needs of populations.
d. Describe communities
e. Assess population needs
f. Evaluate programs
g. Establish baseline data prior to the initiation of
longitudinal studies
20. Advantages of Cross-sectional study
• Cheap, rapid, easy
• Can use large sample of the population.
• May study several outcomes
• Control over selection of subjects
• Control over measurements
• Relatively short duration
• Yields prevalence
• Assess health status, and health problems and indicate
priorities for health care planning. Assess customer’s
satisfaction for health care.
• Provides the base-line data for further studies if the
problem is not studied before.
• Cross sectional study is the most convenient first step in the
investigation of the cause of the outbreak or epidemic
21. Disadvantages of Cross-sectional study
• Does not establish cause/effect ratio
• Potential bias in measuring exposure
• Potential survival bias
• Not feasible for rare disease
• Does not yield incidence
22. Longitudinal Study
• Based on multiple observations in the same
population over a prolong period of time.
23. Uses of Longitudinal Study
• Natural History of Disease
• Identifying Risk factors
• Finding out incidence rate
24. Case study
•Detailed presentation of a single case or handful
of cases
•Generally report a new or unique finding e.g.:
• –previous undescribed disease
• –unexpected link between diseases
• –unexpected new therapeutic effect
• –adverse events
•The case may be an individual, an event, a policy,
etc
25. Case study example
• A man suffered from an Myocardial infarction
at an young age and survived. What are his
questions?
– Why did it happen to me?
– Can I prevent a second attack?
– Are my children at higher risk?
– What can be done to lower my risk?
– What can be done to lower my children’s risk?
26. Case report
Case report
• unit of study: single person with a
disease
• limitation: based on experience of a
single person
• provides first clues in the identification
of a disease or adverse effects of
exposure e.g (halothane induced
hepatitis
27. Case series
Case series :
Unit of study: group of persons with a similar diseases
•Experience of a group of patients with a similar diagnosis
•Assesses prevalent disease
•Cases may be identified from a single or multiple sources
•Generally report on new/unique condition
•A realistic design for rare disorders
• Retrospective look at series of cases that have features in
common
•Common diagnosis, treatment, measures
•Each case may be separately described, or the cases may be
lumped together with data summaries
28. Uses of case series
Formulation of criteria for diagnosis
Formulation of indications for treatment
Identification of prognostic factors
Determination of survival rates
29. Advantages and disadvantages of case
series/case study/ case reports
• Advantages
•Useful for hypothesis generation
•Informative for very rare disease with few established risk factors
•Characterizes averages for disorder
Disadvantages
•Cannot study cause and effect relationships
•Cannot assess disease frequency
• Sequence of events cannot be ascertained
• Not useful for diseases of short period of time
• Not practical in studying rare diseases
• Case reports are susceptible to bias
• Case reports can not be used to make treatment decisions
30. Ecological study designs
• Ecological study also known as correlation study
examine associations between exposure and
disease measures on the population level
• In an ecological study, the units of measurements
are groups of people rather than individuals.
• The incidence of disease in one geographical area
is compared to that of another area. For example
a cancer mortality in areas with hazardous waste
sites as compared to areas without waste sites.
Editor's Notes
Nb. Descriptive study designs is observational . Observational studies is non-interventional and experimental is interventional