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
n122576731422118
 Person years28,608169,859281,601157,90429,941
 Age-adjusted relative risk1.57 (1.28–1.92)1.27 (1.12–1.44)0.98 (0.87–1.11)11.47 (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)11.32 (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)11.29 (1.05–1.59)
Symptomatic diabetes
 Age-adjusted relative risk1.85 (1.44–2.37)1.33 (1.13–1.56)0.97 (0.83–1.13)11.54 (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)11.39 (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)11.36 (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.