Attributable risk and population attributable risk

8,040 views

Published on

FOR MORE PRESENTATIONS
http://medicalpresentation.blogspot.in/

Published in: Health & Medicine
0 Comments
4 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
8,040
On SlideShare
0
From Embeds
0
Number of Embeds
166
Actions
Shares
0
Downloads
164
Comments
0
Likes
4
Embeds 0
No embeds

No notes for slide

Attributable risk and population attributable risk

  1. 1. RISK FACTORAn attribute or exposure that is significantlyassociated with the development of a diseaseEpidemiological methods (case control ,cohortstudy) gives clue to identify risk factors and toestimate degree of risk
  2. 2. Estimation of risk Relative risk = Ie / IneIe –incidence of disease among exposedIne –incidence of disease among nonexposed
  3. 3. Attributable riskIt indicates to what extent the disease under study can beattributed to the exposureattributable risk=Risk difference
  4. 4.  Difference in incidence rates of disease (death) between an exposed group and nonexposed group Often expressed as percentage ATTRIBUTABLE RISK = incidence of disease rate among exposed-incidence of disease rate among non exposed/incidence rate among exposd x 100
  5. 5. drunken Developed Did not develop Total accident accident Yes 70 6930 7000 no 3 2997 3000Incidence rate yes =10 per 1000 no =1 per 1000relative risk = 10/1 = 10Attributable risk = 10-1/10 x 100 = 90%
  6. 6. Over speed Developed accident Did not develop Total( > 75kmhr) accidentYes 80 9920 10000no 10 4990 5000 Incidence rate yes = 8 per 1000 no = 2 per 1000 relative risk = 8/2 = 4 Attributable risk = 8-2/8 x 100 = 75%
  7. 7. POPULATION ATTRIBUTABLE RISK•Reduction in incidence that would be observed if thepopulation were entirely unexposed compared with thecurrent exposure pattern•It is the incidence of the disease /death n the total populationminus the incidence of disease / death among those who werenot exposed to the suspected causal factor
  8. 8. Relative risk vs Attributable riskDrunkenrelative risk = 10/1 = 10Attributable risk = 10-1/10 x 100 = 90%Overspeedrelative risk = 8/2 = 4Attributable risk = 8-2/8 x 100 = 75%
  9. 9. It gives a better idea on the impact of successful preventive /public health programme might have in reducing the problemGuide policy makers in planning public health interventions

×