Variable | Sleep duration quintile (Q; hours) | p-valuea | ||||
---|---|---|---|---|---|---|
 | Q1 (4.00–6.57) | Q2 (6.64–7.14) | Q3 (7.21–7.57) | Q4 (7.64–8.00) | Q5 (8.14–11.00) |  |
Number of individuals | 715 | 668 | 804 | 764 | 435 | Â |
Proportion of population (%) | 21.4 | 18.5 | 24.1 | 22.9 | 13.0 | Â |
Age [mean (years ± s.d.)] | 57.1 ± 5.8 | 58.5 ± 5.9 | 55.3 ± 5.5 | 58.5 ± 5.9 | 57.3 ± 5.9 |  < 0.001 |
Men (%) | 36.5 | 38.7 | 38.6 | 35.2 | 32.2 | 0.15 |
Cystatin C [mean (mg/L ± s.d.)] | 0.780 ± 0.133 | 0.774 ± 0.120 | 0.754 ± 0.124 | 0.773 ± 0.129 | 0.766 ± 0.125 | 0.001 |
Education (%) | Â | Â | Â | Â | Â | 0.003 |
Higher than elementary school | 56.5 | 55.2 | 61.9 | 52.8 | 53.3 | Â |
Physical activity (%) | Â | Â | Â | Â | Â | 0.05 |
Quartile 1 (low physical activity) | 26.0 | 23.8 | 24.3 | 24.2 | 27.4 | Â |
Quartile 2 | 22.9 | 26.5 | 29.1 | 23.4 | 25.1 | Â |
Quartile 3 | 24.3 | 24.3 | 26.0 | 24.4 | 22.1 | Â |
Quartile 4 (high physical activity) | 26.7 | 25.4 | 20.7 | 28.0 | 25.5 | Â |
Smoking status (%) | Â | Â | Â | Â | Â | 0.44 |
Never | 40.1 | 43.5 | 43.7 | 45.0 | 39.5 | Â |
Past | 33.7 | 32.0 | 30.6 | 31.9 | 34.3 | Â |
Current < 20 cigarettes/day | 13.6 | 12.3 | 14.3 | 11.9 | 11.3 |  |
Current ≥ 20 cigarettes/day | 12.6 | 12.1 | 11.4 | 11.1 | 14.9 |  |
Alcohol consumption (%) | Â | Â | Â | Â | Â | 0.03 |
None | 18.0 | 15.7 | 12.2 | 16.1 | 17.2 | Â |
0.02–1.70 g ethanol/day | 10.8 | 9.7 | 9.8 | 10.7 | 12.2 |  |
1.70–6.87 g ethanol/day | 22.5 | 25.2 | 22.6 | 27.4 | 25.3 |  |
6.89–14.36 g ethanol/day | 24.5 | 23.6 | 27.1 | 24.6 | 22.5 |  |
 ≥ 14.36 g ethanol/day | 24.2 | 25.7 | 28.2 | 21.2 | 22.8 |  |
Shift work (%) | 28.8 | 30.1 | 22.8 | 27.1 | 32.2 | 0.002 |
Insomnia symptoms [median (score, iqr.)] | 4 (5) | 3 (4) | 2 (3) | 3 (4) | 3 (3) |  < 0.001 |
Waist circumference [mean (cm ± s.d.)] | 82.9 ± 12.7 | 83.4 ± 12.0 | 81.6 ± 11.5 | 82.1 ± 12.1 | 81.9 ± 12.3 | 0.048 |
LDL-C [mean (mmol/L ± s.d.)] | 4.3 ± 1.0 | 4.2 ± 0.9 | 4.1 ± 1.0 | 4.2 ± 1.0 | 4.1 ± 0.9 | 0.01 |
HDL-C [mean (mmol/L ± s.d.)] | 1.4 ± 0.4 | 1.4 ± 0.4 | 1.4 ± 0.4 | 1.4 ± 0.4 | 1.4 ± 0.4 | 0.89 |
Triglycerides [mean (mmol/L ± s.d.)] | 1.3 ± 0.6 | 1.3 ± 0.6 | 1.3 ± 0.6 | 1.3 ± 0.6 | 1.3 ± 0.7 | 0.81 |
HbA1c [mean (% ± s.d.)] | 4.8 ± 0.4 | 4.8 ± 0.4 | 4.7 ± 0.4 | 4.8 ± 0.4 | 4.8 ± 0.4 | 0.14 |
BMI | Â | Â | Â | Â | Â | 0.16 |
 < 18.5 kg/m2 | 1.1 | 1.0 | 0.6 | 1.1 | 0.7 |  |
18.5–25.0 kg/m2 | 47.7 | 45.3 | 52.4 | 48.4 | 49.4 |  |
25.0–30.0 kg/m2 | 38.6 | 42.2 | 39.3 | 39.1 | 38.6 |  |
 ≥ 30.0 kg/m2 | 12.6 | 11.5 | 7.7 | 11.4 | 11.3 |  |