The ORs (95% CIs) of acute myocardial infarction relative to working time, numbers of days off, and sleeping time in the past year
| OR (95% CI) | ||
|---|---|---|
| Variable | Crude | Adjusted* |
| Matched odds ratios are based on conditional logistic regression analysis; *adjusted for cigarette-year, alcohol drinking, overweight, hypertension, diabetes mellitus, hyperlipidaemia, parental coronary heart disease, job type, and sedentary job. | ||
| Working h/week: | ||
| ≤40 | 1.0 (referent) | 1.0 (referent) |
| 41–60 | 1.3 (0.9 to 1.8) | 1.3 (0.9 to 2.0) |
| ≥61 | 2.1 (1.3 to 3.6) | 1.8 (1.0 to 3.3) |
| Days off/month: | ||
| ≥8 | 1.0 (referent) | 1.0 (referent) |
| 2–7 | 1.0 (0.8 to 1.4) | 1.0 (0.7 to 1.4) |
| <2 | 1.0 (0.8 to 1.2) | 1.0 (0.8 to 1.3) |
| Workday sleeping hours: | ||
| ≥9 | 1.3 (0.6 to 2.6) | 1.5 (0.6 to 3.8) |
| 6–8 | 1.0 (referent) | 1.0 (referent) |
| ≤5 | 2.3 (1.3 to 3.4) | 2.5 (1.1 to 5.3) |
| Days off sleeping hours: | ||
| ≥9 | 1.0 (0.7 to 1.5) | 1.1 (0.7 to 1.7) |
| 6–8 | 1.0 (referent) | 1.0 (referent) |
| ≤5 | 1.6 (0.8 to 3.6) | 1.8 (0.7 to 4.7) |
| Days/week of <5h sleep: | ||
| 0 | 1.0 (referent) | 1.0 (referent) |
| 1 | 1.2 (0.9 to 1.7) | 1.1 (0.7 to 1.7) |
| ≥2 | 2.3 (1.2 to 4.4) | 2.1 (0.9 to 4.6) |