Table 1.
Description of the cohorts (women) at baseline
| Variables | Shift work status | |||||||||||||||
| Day work | Shift work without nights | Shift work with nights | All | |||||||||||||
| n | % | Mean | SD | n | % | Mean | SD | n | % | Mean | SD | n | % | Mean | SD | |
| Age | ||||||||||||||||
| <50 years | 16 478 | 70.2 | 39.9 | 6.4 | 2772 | 62.3 | 39.6 | 7.0 | 4315 | 79.6 | 37.8 | 7.4 | 23 565 | 70.6 | 39.5 | 6.7 |
| 50+ years | 7008 | 29.8 | 53.6 | 2.7 | 1679 | 27.7 | 53.7 | 2.7 | 1107 | 20.4 | 53.1 | 2.3 | 9794 | 29.4 | 53.5 | 2.6 |
| All | 23 486 | 100.0 | 44.0 | 8.3 | 4451 | 100.0 | 44.9 | 9.0 | 5422 | 100.0 | 40.9 | 9.1 | 33 359 | 100.0 | 43.6 | 8.6 |
| Socioeconomic status | ||||||||||||||||
| Upper white collar | 36.8 | 10.7 | 1.8 | 28.9 | ||||||||||||
| Lower white collar | 34.0 | 28.1 | 59.6 | 37.3 | ||||||||||||
| Skilled blue collar | 18.3 | 32.8 | 36.7 | 23.3 | ||||||||||||
| Other blue collar | 9.1 | 28.5 | 1.9 | 10.5 | ||||||||||||
| Children <6 years old | ||||||||||||||||
| No | 48.7 | 48.5 | 43.7 | 47.8 | ||||||||||||
| Yes | 21.9 | 18.8 | 22.5 | 21.5 | ||||||||||||
| Missing | 29.5 | 32.8 | 33.8 | 30.6 | ||||||||||||
| Children 7–8 years old | ||||||||||||||||
| No | 33.6 | 35.6 | 35.8 | 34.5 | ||||||||||||
| Yes | 35.8 | 28.5 | 28.1 | 33.6 | ||||||||||||
| Missing | 30.6 | 22.9 | 36.1 | 31.9 | ||||||||||||
| Smoking | ||||||||||||||||
| No | 83.6 | 75.9 | 79.3 | 81.9 | ||||||||||||
| Yes | 14.1 | 21.1 | 17.7 | 15.6 | ||||||||||||
| Missing | 2.3 | 3.0 | 3.0 | 2.5 | ||||||||||||
| Body mass index (kg/m2) | 24.8 | 4.2 | 25.2 | 4.1 | 24.9 | 4.1 | 24.9 | 4.1 | ||||||||
| Alcohol consumption (g/week) | 52.5 | 81.4 | 45.3 | 79.8 | 43.1 | 73.9 | 50.0 | 80.1 | ||||||||