Exposure to multiple outcomes can be studied in
Coho study
Case control study
Cross sectional study
Ecological study
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.
Classification, Coho Study