Of the different epidemiological study designs available to test the association between risk factor and disease, the best design is of
Correct Answer: Coho study
Description: 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
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