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Table 4.

Sleep quality and breast cancer risk in a cohort of Finnish women, 1976 to 1996

No. of women (n = 12,084)No. of breast cancersAge-adjusted HR (95% CI)Multivariable HR (95% CI)*
Sleep quality in 1975, follow-up 1976 to 1996     
    Good 5,245 103 1.00 1.00 
    Fairly good 5,803 113 0.84 (0.64-1.10) 0.84 (0.63-1.12) 
    Fairly poor 787 16 0.66 (0.39-1.13) 0.78 (0.45-1.35) 
    Poor 249 0.99 (0.47-2.07) 1.15 (0.54-2.43) 
    P for linear trend (categorical)   0.21 0.52 
Subjects with the same sleep quality in 1975 and 1981, follow-up 1976 to 1996     
    Good 3,047 56 1.00 1.00 
    Fairly good 3,270 70 0.95 (0.67-1.35) 0.91 (0.62-1.32) 
    Fairly poor 219 0.75 (0.30-1.90) 0.89 (0.35-2.27) 
    Poor 58 1.58 (0.45-5.52) 1.87 (0.52-6.73) 
    P for linear trend (categorical)   0.92 0.97 
No. of women (n = 12,084)No. of breast cancersAge-adjusted HR (95% CI)Multivariable HR (95% CI)*
Sleep quality in 1975, follow-up 1976 to 1996     
    Good 5,245 103 1.00 1.00 
    Fairly good 5,803 113 0.84 (0.64-1.10) 0.84 (0.63-1.12) 
    Fairly poor 787 16 0.66 (0.39-1.13) 0.78 (0.45-1.35) 
    Poor 249 0.99 (0.47-2.07) 1.15 (0.54-2.43) 
    P for linear trend (categorical)   0.21 0.52 
Subjects with the same sleep quality in 1975 and 1981, follow-up 1976 to 1996     
    Good 3,047 56 1.00 1.00 
    Fairly good 3,270 70 0.95 (0.67-1.35) 0.91 (0.62-1.32) 
    Fairly poor 219 0.75 (0.30-1.90) 0.89 (0.35-2.27) 
    Poor 58 1.58 (0.45-5.52) 1.87 (0.52-6.73) 
    P for linear trend (categorical)   0.92 0.97 
*

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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