In population of 9000, 2100 were alcoholics out of which 70 alcoholics developed cirrhosis, 23 non-alcoholics developed cirrhosis. Calculate attribute risk
ATTRIBUTABLE RISK Attributable risk (AR) is the difference in incidence rates of disease (or death) between an exposed group and non- exposed group. Some authors use the term "risk difference" to attributable risk. Total population =9000 No.of alcoholics =2100 No.of alcoholics developed cirrhosis =70 No.of Non-alcoholics developed cirrhosis =23 AR= 70-23/70 x100 = 67%(approx) Attributable risk indicates to what extent the disease under study can be attributed to the exposure. The figure in our example indicates that the association between alcohol and liver cirrhosis is causal, 67 per cent of the cirrhosis among alcoholics was due to their alcoholism. This suggests the amount of disease that might be eliminated if the factor under study could be controlled or eliminated. Ref : Park 23rd edition Pgno : 78
90%
70%
60%
40%
Epidemiology