Of the different epidemiological study designs available to test the association between risk factor and disease, the best design is of-: (A) Case-control study, (B) Ecological study, (C) Coho study, (D) Cross-sectional study
Answer is C. - Coho study gives the strongest evidence of association. - Strength of association in coho study is calculated by: Relative risk - Best indicator as it has lower biases as compared to other studies. Attributable risk. Population attributable risk.