The Framingham hea study is an example of-: (A) Case-control study, (B) Coho study, (C) Randomized controlled trial, (D) Cross-sectional study
Answer is B. Coho study is also known as incidence study. The cohos are identified prior to the appearance of disease under investigation. The study group so defined are observed over a period of time to determine the frequency of disease among them. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 83