Tobacco & Alcohol — Epidemiology & Control — Topic Test
18 questions · exam mode (answers revealed at the end). 18 min suggested.
During analysis of a case-control study on tobacco chewing and oral cancer, the crude odds ratio is 4.2, but on stratifying by alcohol use the stratum-specific odds ratios are 2.1 and 2.0, both differing from the crude value. Alcohol use is associated with both exposure and outcome and is not on the causal pathway. This phenomenon is best termed:
AConfounding
BInformation bias
CEffect modification
DBerkson bias