True about case control study: (A) Less expensive, (B) Those with disease and no diseased compared, (C) Attributable risk is estimated, (D) None of these
Answer is A. Advantages of case-control study: Easy to carry out Rapid and inexpensive Suitable to investigate rare disease Require comparatively few subjects Risk factors can be identified No attrition problems Ethical problems minimal (pg no: 74 park 23 rd edition)