A cohort study was carried out to investigate HIV status as risk factor for tuberculosis. Out of a total of 1641 individuals, 70 were HIV positive at the start of the study. Seven of HIV positive status tested positive for tuberculosis at the end of follow up. Fifty two of HIV negative individuals also tested positive for tuberculosis.
(a) Estimate and interpret the relative risk. You do not need to calculate 95% confidence interval.
(b) Estimate and interpret the odds ratio. You do not need to calculate 95% confidence interval.
(c) Estimate and interpret the attributable risk of TB for HIV positive status.
The solution gives detailed steps on calculating the relative risk, odds ratio and attributable risk for a specific HIV example and then interpretating these three estimates. All formula and calculations are shown and explained.