Cohort studies allow true determination of incidence of an outcome.Question 2Select one:TrueFalse

True or False: A cohort study is the best method for associating cause and effect when exposure or treatment cannot be controlled by the investigator but when we want to be certain that exposure preceded the health outcome.True False

Question 8Answera.Case-controlb.Retrospective cohortc.Prospective cohortd.Cross-sectional

True or false: In a cross-sectional study we cannot determine whether exposure precedes the health outcome.TrueFalse

Confounding and bias is more a problem in prospective cohort studies than retrospective cohort studies.

Which of the following statements are true regarding prospective studies?Group of answer choicesCan be used to estimate a relative riskCan be used to estimate an odds ratioConsiders random samples from each of the two outcome categories which are followed back (retrospectively) to determine the presence or absence of the risk factor for each individualConsiders subjects initially identified as disease-free and classified by presence or absence of a risk factorOften takes a long time to complete