Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Attributable risk and population attributable risk

10,474 views

Published on

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

Published in: Health & Medicine
  • Be the first to comment

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

×