Oral contraceptive | Non-smokers | Smokers | |||
---|---|---|---|---|---|
1–19 cigarettes/day | 20+ cigarettes/day | ||||
Non-users | 44/931 (4.5) | 57/217 (20.8) | 151/192 (44.0) | ||
OR (95% CI) | 1 | 1 | 1 | ||
Combined3-150 | 6/131 (4.4) | 11/23 (32.4) | 15/19 (44.1) | ||
OR (95% CI) | 0.97 (0.41 to 2.32) | 1.82 (0.84 to 3.95) | 1.0 (0.49 to 1.94) |
Values are number of cases/controls (% cases/total).
↵3-150 Containing ⩽ 35 μg ethinyloestradiol and progestogen.