Table 4.
Multivariatea rate ratios estimates and 95% confidence intervals for proximal and distal colon cancer according to smoking status among 68,160 women
| Smoking status | Proximal colon cancer n = 137 | Distal colon cancer n = 108 | ||||
|---|---|---|---|---|---|---|
| Cases | RR | 95% CI | Cases | RR | 95% CI | |
| Never | 44 | 1.0 | Ref | 36 | 1.0 | Ref |
| Former | 53 | 1.6 | (1.1–2.4) | 46 | 1.7 | (1.1–2.7) |
| Current | 40 | 1.4 | (0.9–2.1) | 26 | 1.0 | (0.6–1.6) |
| Ever | 93 | 1.5 | (1.0–2.2) | 72 | 1.3 | (0.9–2.0) |
aAdjusted for age, menopausal status, hormonal contraceptive and postmenopausal hormonal therapy use, BMI and alcohol consumption, all at enrolment