Conditional odds ratios for myocardial infarction by different levels of reported cigarette consumption, and for smoking overall
| Cigarettes per day (n) | Cases n (%) | Controls n (%) | Odds ratio (95% CI) |
|---|---|---|---|
| 0 | 88 (19.6) | 1208 (70.0) | 1 |
| 1–5 | 10 (2.2) | 42 (2.4) | 2.49 (1.13 to 5.52) |
| 6–10 | 32 (7.1) | 113 (6.5) | 4.07 (2.54 to 6.52) |
| 11–19 | 65 (14.5) | 117 (6.8) | 7.94 (5.26 to 11.99) |
| 20–39 | 209 (46.7) | 238 (13.8) | 14.03 (10.12 to 19.47) |
| ⩾ 40 | 44 (9.8) | 9 (0.5) | 74.64 (32.97 to 168.9) |
| All smokers | 360 (80.4) | 519 (30.1) | 9.99 (7.59 to 13.2) |