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Table 2—

Relative risks (95% CIs) of incident diabetes according to self-reported sleep duration at baseline

Hours of sleep per day
≤56789+
Total diabetes      
n 122 576 731 422 118 
 Person years 28,608 169,859 281,601 157,904 29,941 
 Age-adjusted relative risk 1.57 (1.28–1.92) 1.27 (1.12–1.44) 0.98 (0.87–1.11) 1.47 (1.19–1.80) 
 Multivariate model without BMI* 1.29 (1.05–1.58) 1.16 (1.02–1.32) 1.02 (0.91–1.16) 1.32 (1.07–1.62) 
 Multivariate model including BMI (8 categories)* 1.18 (0.96–1.44) 1.10 (0.97–1.25) 1.02 (0.91–1.16) 1.29 (1.05–1.59) 
Symptomatic diabetes      
 Age-adjusted relative risk 1.85 (1.44–2.37) 1.33 (1.13–1.56) 0.97 (0.83–1.13) 1.54 (1.18–2.01) 
 Multivariate model without BMI* 1.52 (1.19–1.96) 1.21 (1.03–1.43) 1.01 (0.86–1.18) 1.39 (1.07–1.81) 
 Multivariate model including BMI (8 categories)* 1.37 (1.07–1.77) 1.13 (0.96–1.34) 1.00 (0.86–1.18) 1.36 (1.04–1.73) 
Hours of sleep per day
≤56789+
Total diabetes      
n 122 576 731 422 118 
 Person years 28,608 169,859 281,601 157,904 29,941 
 Age-adjusted relative risk 1.57 (1.28–1.92) 1.27 (1.12–1.44) 0.98 (0.87–1.11) 1.47 (1.19–1.80) 
 Multivariate model without BMI* 1.29 (1.05–1.58) 1.16 (1.02–1.32) 1.02 (0.91–1.16) 1.32 (1.07–1.62) 
 Multivariate model including BMI (8 categories)* 1.18 (0.96–1.44) 1.10 (0.97–1.25) 1.02 (0.91–1.16) 1.29 (1.05–1.59) 
Symptomatic diabetes      
 Age-adjusted relative risk 1.85 (1.44–2.37) 1.33 (1.13–1.56) 0.97 (0.83–1.13) 1.54 (1.18–2.01) 
 Multivariate model without BMI* 1.52 (1.19–1.96) 1.21 (1.03–1.43) 1.01 (0.86–1.18) 1.39 (1.07–1.81) 
 Multivariate model including BMI (8 categories)* 1.37 (1.07–1.77) 1.13 (0.96–1.34) 1.00 (0.86–1.18) 1.36 (1.04–1.73) 
*

Adjusted for shiftworking (from 1988), hypercholesterolemia, hypertension, smoking, snoring, exercise, alcohol, depression (from 1992), postmenopausal hormone use, and family history of diabetes.

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