Incidence rate is measured by-: (A) Case control study, (B) Coho study, (C) Cross sectional study, (D) Cross over study
Answer is B. Coho study is also known as incidence study Features of coho study: Coho identified prior to the disease under investigation Study group so defined are observed over a period of time to determine the frequency of disease among them Study proceeds forward from cause to effect (pg no : 75 park 23 rd edition)