Table 1

Relation between cigarette smoking and colorectal adenomas

VariableNo. of men (%)Crude OR (95% CI)Adjusted ORa (95% CI)
CaseControl
Smoking
Never smoker35 (17.1)73 (33.2)1.01.0
Past smoker41 (20.0)72 (32.7)1.2 (0.7–2.1)1.1 (0.6–1.9)
<25 cigarettes/day83 (40.5)51 (23.2)3.4 (2.0–5.8)3.5 (2.0–6.1)
25+ cigarettes/day46 (22.4)24 (10.9)4.0 (2.1–7.6)3.8 (2.0–7.4)
Cigarette-years
036 (17.6)73 (33.2)1.01.0
1–39934 (16.6)47 (21.4)1.5 (0.8–2.7)1.4 (0.8–2.6)
400–79991 (44.4)80 (36.4)2.3 (1.4–3.8)2.2 (1.3–3.6)
800+44 (21.5)20 (9.1)4.5 (2.3–8.7)4.1 (2.1–8.2)
TrendbP = 0.0001P = 0.0001
  • Adjusted for hospital, rank in the SDF, alcohol use, and body mass index.

  • Ordinal scores 0, 1, 2, and 3 were assigned to the four levels of cumulative exposure.