Exposure to multiple outcomes can be studied in: (A) Coho study, (B) Case control study, (C) Cross sectional study, (D) Ecological study
Answer is A. In Coho study, multiple outcomes can be studied together. In Case control study, multiple exposures can be studied together. COHO STUDY: Time consuming & expensive study Incidence & RR can be calculated No recall bias Ethical problems are present & is not useful for rare diseases Loss of follow-up can be seen - max allowable attrition rate is < 5% ; ideal retention rate >= 95% HAWTHORN BIAS - study subjects alter their behavior without notice ; can be seen.