Subject characteristics (means or proportions) in a cohort of Finnish women by sleep duration at baseline in 1975
| Characteristic . | Duration of sleep . | . | . | . | . | ||||
|---|---|---|---|---|---|---|---|---|---|
| . | ≤6 h (n = 1,181) . | 7 h (n = 3,473) . | 8 h (n = 5,580) . | ≥9 h (n = 1,988) . | All (n = 12,222) . | ||||
| Age at baseline (y) | 43.7 | 37.1 | 35.1 | 35.1 | 36.5 | ||||
| Age at first full-term pregnancy (y) | 24.6 | 24.4 | 24.5 | 24.1 | 24.4 | ||||
| Number of children (in women with children) | 2.6 | 2.3 | 2.3 | 2.2 | 2.3 | ||||
| Body mass index (kg/m2) | 23.4 | 22.7 | 22.5 | 22.7 | 22.7 | ||||
| Alcohol use (g/mo) | 134 | 128 | 108 | 106 | 116 | ||||
| Dizygotic twins (%) | 67.1 | 67.4 | 66.6 | 69.0 | 67.3 | ||||
| White collar and intermediate workers (%) | 54.5 | 66.0 | 66.1 | 61.5 | 64.2 | ||||
| Nulliparous women (%) | 38.9 | 44.4 | 45.0 | 46.6 | 44.5 | ||||
| Ever used oral contraceptives (%) | 28.3 | 33.8 | 33.7 | 33.9 | 33.2 | ||||
| Sedentary exercisers (%) | 23.3 | 16.3 | 15.7 | 18.2 | 17.0 | ||||
| Current smokers (%) | 29.4 | 26.1 | 20.9 | 20.4 | 23.1 | ||||
| Insufficient sleep in 1981 ≥1 h (%) | 31.4 | 24.8 | 19.1 | 16.5 | 21.4 | ||||
| Sleep quality rated poor (%) | 11.6 | 1.4 | 0.8 | 0.8 | 2.0 | ||||
| Characteristic . | Duration of sleep . | . | . | . | . | ||||
|---|---|---|---|---|---|---|---|---|---|
| . | ≤6 h (n = 1,181) . | 7 h (n = 3,473) . | 8 h (n = 5,580) . | ≥9 h (n = 1,988) . | All (n = 12,222) . | ||||
| Age at baseline (y) | 43.7 | 37.1 | 35.1 | 35.1 | 36.5 | ||||
| Age at first full-term pregnancy (y) | 24.6 | 24.4 | 24.5 | 24.1 | 24.4 | ||||
| Number of children (in women with children) | 2.6 | 2.3 | 2.3 | 2.2 | 2.3 | ||||
| Body mass index (kg/m2) | 23.4 | 22.7 | 22.5 | 22.7 | 22.7 | ||||
| Alcohol use (g/mo) | 134 | 128 | 108 | 106 | 116 | ||||
| Dizygotic twins (%) | 67.1 | 67.4 | 66.6 | 69.0 | 67.3 | ||||
| White collar and intermediate workers (%) | 54.5 | 66.0 | 66.1 | 61.5 | 64.2 | ||||
| Nulliparous women (%) | 38.9 | 44.4 | 45.0 | 46.6 | 44.5 | ||||
| Ever used oral contraceptives (%) | 28.3 | 33.8 | 33.7 | 33.9 | 33.2 | ||||
| Sedentary exercisers (%) | 23.3 | 16.3 | 15.7 | 18.2 | 17.0 | ||||
| Current smokers (%) | 29.4 | 26.1 | 20.9 | 20.4 | 23.1 | ||||
| Insufficient sleep in 1981 ≥1 h (%) | 31.4 | 24.8 | 19.1 | 16.5 | 21.4 | ||||
| Sleep quality rated poor (%) | 11.6 | 1.4 | 0.8 | 0.8 | 2.0 | ||||