Which of the following is true about Cohort study?
Incidence can be calculated
It is from effect to cause
It is inexpensive
Shorter time than case control
Ans: A (Incidence can be calculated) Ref: Text book of preventive and social medicine, K Park, 22nd edition. page no 72Explanation:Cohort studyIt is an important study design to measure incidence.It is followed from exposure to outcome (cause to effect), unlike ease control study (effect to cause)It involves follow up of a cohort (group with common character, birth cohort, cohort joining service in particular year etc.)During follow up exposure and outcome is measured at periodic intervals OutcomeContinuousDiscreteNumericalOrdinalDichotomousPolvchO'tomousXominalPolychotomousOrdinalContinuousPearson Correlation & RegressionPearson Correlation & RegressionSpearmanRankcorrelation't' testANOVAANOVADiscrete- do -- d -- do -- do -- do -- do -NumericalOrdinalSpearmanRankcorrelationSpearmanRankcorrelationSpearmanRankcorrelationMann Whitney U testKruskal Wallis testKruskal Wallis testDichotomoust testt testMann Whitney U testChi square for 2x2 tableChi square for r x c tableChi square for linear trend in proportionsPolychotomousOrdinalANOVAANOVAKruskal WallisChi square for r x c tableChi square for r x c tableChi square for r x c tablePolychotomousOrdinalANOVAANOVAKruskal WallisChi square for linear trend in proportions- do -- do -Generally followed for long time, until outcome occursThus, it involves high costMeasures relative risk, attributable risk, population attributable risk as strength of association
Analytical Epidemiology