Unconditional odds ratios for myocardial infarction in users of combined oral contraceptives, stratified by smoking habit, in those without clinical risk factors
| 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.