Smoking and the risk of acute myocardial infarction
| Variable | Total | Cases | Controls | *Unadjusted odds ratio (95% CI) |
|---|---|---|---|---|
| Values are n (%). | ||||
| *Odds ratios for acute myocardial infarction were computed using logistic regression after matching cases with controls. Reference group was never-smokers (never smoked at any time). | ||||
| Never smoked | 207 (53.6) | 69 (35.8) | 138 (71.5) | 1.00 |
| Former smoker | 38 (9.7) | 24 (12.4) | 14 (7.3) | 5.89 (2.43 to 14.27) |
| Current smoker | 141 (36.5) | 100 (51.8) | 41 (21.2) | 6.85 (3.66 to 12.81) |
| 1–10 cigarettes/day | 37 (9.5) | 17 (8.8) | 20 (10.4) | 1.89 (0.87 to 4.09) |
| >10 cigarettes/day | 91 (23.3) | 71 (36.8) | 20 (10.4) | 6.44 (3.36 to 12.35) |
| Age (years) when started smoking | 19.7 (5.7) | 18.8 (5.6) | 21.9 (6.1) | 0.73 (0.57 to 0.95) for each year increase in age |