Incidence rate can be calculated from:: (A) Coho study, (B) Case control study, (C) Cross sectional study, (D) Descriptive study
Answer is A. Only Coho study follows patient for a definite time period. It proceeds from cause to effect. So incidence can be calculated. Besides relative risk as well as attributable risk are also derived from coho study. While case control study study yields only estimate of relative risk. Cross sectional study yields prevalence rate. Ref: Park 21st edition, page 71.