Cross-product ratio is estimated by ?: (A) Coho study, (B) Case-control study, (C) Cross sectional study, (D) Field trial
Answer is B. Ans. is 'b' i.e., Case-control studyOdds - ratio (cross product ratio)From a case control study odds ratio can be derived which a measure of the strength of association between risk factor and outcome.Odds ratio is closely related to relative risk (which is analysed in coho study) 4 odds ratio represents only an estimate of relative risk.