Which of the following is true about Cohort study?
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
Incidence can be calculated
It is from effect to cause
It is inexpensive
Shorter time than case control
Analytical Epidemiology