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) Cohort study, (D) Cross-sectional study
Answer is C. Ans. is 'c' i.e., Cohort study Comparison of various epidemiological EcologicalCross sectionalCase controlCohortProbability of selection biasNAMediumHighLowRecall biasNAHighHighLowLoss to follow upNANALowHighConfoundingHighMediumMediumLowTime required.LowMediumMediumHigh. CostLowMediumMediumHighStrength of causal interferenceLowLowMediumHigh