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Table 3.

Insufficient sleep and breast cancer risk in a cohort of Finnish women, 1982 to 1996

Insufficient sleep in 1981Hours of sleep, mean (median)No. of women (n = 10,844)No. of breast cancersAge-adjusted HR (95% CI)Multivariable HR (95% CI)*
No lack of sleep (<1 h, reference) 7.8 (8.0) 8,532 138 1.00 1.00 
Lack of sleep ≥1 h 7.1 (7.0) 2,312 41 1.17 (0.82-1.67) 1.19 (0.84-1.70) 
1 h increase in lack of sleep (0-4 h) 7.6 (7.5) 9,042 144 1.11 (0.86-1.43) 1.12 (0.87-1.45) 
Insufficient sleep in 1981Hours of sleep, mean (median)No. of women (n = 10,844)No. of breast cancersAge-adjusted HR (95% CI)Multivariable HR (95% CI)*
No lack of sleep (<1 h, reference) 7.8 (8.0) 8,532 138 1.00 1.00 
Lack of sleep ≥1 h 7.1 (7.0) 2,312 41 1.17 (0.82-1.67) 1.19 (0.84-1.70) 
1 h increase in lack of sleep (0-4 h) 7.6 (7.5) 9,042 144 1.11 (0.86-1.43) 1.12 (0.87-1.45) 
*

Adjusted for the effects of age, zygosity, social class, number of children, use of oral contraceptives, body mass index, alcohol use, smoking, and physical activity.

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