Of the different epidemiological study designs available to test the association between risk factor and disease, the best design is of
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
Case control study
Ecological study
Coho study
Cross sectional study
Epidemiology