In case control study of buccal carcinoma:
CA is commoner in zarda pan users than non-users
Zarda pan is a cause of buccal CA
Zarda pan is associated with buccal CA
If use of zarda pan is stopped, number of cases will reduce
Ans. is 'c' i.e. Zarda pan is associated with buccal Ca. In a case control study, case and effect relationship is not established, we only get to know about associated factors.
Analytical Epidemiology