Table 3. Relative risk of distal colorectal adenoma according to history of cholecystectomy among 26005 women of the NHS (1452 cases of distal colorectal adenoma)a.
| No. of cases/total no. of women | Multivariate RR (95% CI) | |
|---|---|---|
| All women with adenomas | ||
| All adenomas | 1452/26 005 | 1.05 (0.88–1.26) |
| Small adenomas | 780 | 1.06 (0.83–1.35) |
| Large adenomas | 590 | 1.03 (0.78–1.36) |
| Women with adenomas and previously negative endoscopic resultsb | ||
| All adenomas | 332/7182 | 1.06 (0.74–1.52) |
| Small adenomasc | 188 | 1.04 (0.65–1.67) |
| Large adenomasd | 122 | 0.91 (0.49–1.69) |
a
RR, relative risk; CI, confidence interval.
b
Women who underwent endoscopy before 1982 with negative results.
c
Small sigmoid/rectal adenomas (<1 cm).
d
Large sigmoid/rectal adenomas (⩾1 cm)