Skip to Main Content
Table 1.

Subject characteristics (means or proportions) in a cohort of Finnish women by sleep duration at baseline in 1975

CharacteristicDuration 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/m223.4 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 
CharacteristicDuration 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/m223.4 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 
Close Modal

or Create an Account

Close Modal
Close Modal