Table 1. Baseline characteristics by incident myocardial infarction status and by baseline exposure to road traffic noise below and above 60 dB (Lden).
| Cohort | Cases | Lden ≤60 | Lden >60 | |
| Characteristic at enrolment | (N = 50 614) | (N = 1600) | (N = 33 325) | (N = 17 289) |
| Men, % | 48 | 74 | 48 | 46 |
| Age, y | 56.1 (50.7–64.2) | 58.8 (51.1–64.7) | 56.0 (50.7–64.1) | 56.3 (50.8–64.2) |
| BMI, kg/m2 | 25.5 (20.4–33.2) | 26.8 (21.1–34.6) | 25.4 (20.5–33.0) | 25.7 (20.3–33.8) |
| Years of education, % | ||||
| ≤7 | 33 | 45 | 31 | 36 |
| 8–10 | 46 | 39 | 47 | 46 |
| >10 | 21 | 16 | 22 | 18 |
| Smoking status, % | ||||
| Never | 36 | 19 | 38 | 32 |
| Former | 28 | 25 | 29 | 27 |
| Current 1–14 g/day | 13 | 15 | 13 | 14 |
| Current 15–24 g/day | 16 | 27 | 15 | 19 |
| Current ≥25 g/day | 7 | 14 | 6 | 8 |
| Smoking duration, y a | 32 (6–46) | 37 (10–49) | 32 (6–46) | 33 (7–46) |
| Drink alcohol, % | 98 | 96 | 98 | 97 |
| Alcohol intake, g/day | 13.4 (1.14–64.7) | 15.0 (1.00–69.4) | 13.4 (1.20–62.2) | 13.3 (1.00–69.6) |
| Fruit intake, g/day | 169 (27.0–521) | 147 (19.0–479) | 172 (29.0–515) | 163 (24.3–533) |
| Vegetable intake, g/day | 162 (49.2–366) | 136 (40.8–337) | 165 (51.9–366) | 155 (44.5–368) |
| Physically active | ||||
| No, % | 24 | 32 | 23 | 25 |
| Yes, ≤ 3.5 h/week, % | 41 | 37 | 42 | 38 |
| Yes, > 3.5 h/week, % | 36 | 31 | 35 | 37 |
| Self-reported diabetes, % | 2.0 | 5.4 | 1.8 | 2.4 |
| Systolic blood pressure, mm Hg | 138 (109–176) | 148 (116–188) | 138 (110–175) | 139 (109–177) |
| Diastolic blood pressure mm Hg | 83 (67–101) | 87 (70–108) | 83 (67–101) | 83 (67–101) |
| Total cholesterol, mmol/L | 6.0 (4.4–8.2) | 6.3 (4.5–8.6) | 6.0 (4.4–8.1) | 6.1 (4.4–8.2) |
| Road traffic noise, dB | 56.4 (48.5–70.1) | 57.7 (48.8–70.6) | 53.6 (47.6–59.2) | 64.5 (60.4–73.0) |
| Air pollution, NOx, µg/m3 | 20.8 (14.4–88.0) | 21.8 (14.4–103) | 18.5 (14.2–28.2) | 34.2 (16.9–137) |
Values are medians (5–95 percentiles) unless otherwise stated.
a
Among present and former smokers.