In a case-control study of a suspected association between breast cancer and the contraceptive pill, all of the following are true statements except
The attributable risk of breast cancer resulting from the pill may be directly measured. AR calculation requires incidence which can be obtained from only a coho study. Reference: Park's textbook of preventive and social medicine, 23rd edition, page no:78
The control should come from a population that has the same potential for breast cancer as the cases
The control should exclude women known to be taking the pill at the time of the survey
All the controls need to be healthy
The attributing risk of breast cancer resulting from the pill may be directly measured
Epidemiology