Table 3

CYP2A6 phenotype among colorectal cancer cases and controls

Urinary 17U:17X ratio, tertilesCases (%)Controls (%)ORa95% CI
Low23 (18.1)111 (33.3)1.0
Medium41 (32.2)111 (33.3)2.01.0–3.7
High63 (48.9)111 (33.3)2.91.6–5.0
  • a OR for matched cases and controls (one or more controls per case, matched on age, sex, race, and geographic region) calculated from conditional logistic regression model, adjusted for age and smoking status.