Table 1 Characteristics of study participants, classified by sleep duration (unweighted)
| Â | Total | Hours of sleep per day | p-value | ||||
|---|---|---|---|---|---|---|---|
|  | ≤5 | 6 | 7–8 | 9 | ≥10 | ||
# of participants | 13,441 | 1,588 | 1,826 | 4,877 | 1,133 | 4,017 | NA |
% participant across sleep hours | 100.0 | 11.81 | 13.59 | 36.28 | 8.43 | 29.89 | NA |
% Death in 2008–2014 | 58.4 | 57.0 | 52.8 | 51.2 | 56.0 | 70.8 | < 0.001 |
Frequency of vegetable consumption | |||||||
 % High | 87.6 | 83.6 | 88.5 | 89.4 | 89.8 | 86.4 | < 0.001 |
Demographics | |||||||
 Age (mean, years) | 87.0 | 86.2 | 85.0 | 85.0 | 86.0 | 91.1 | < 0.001 |
 % Aged over 80 years | 73.1 | 72.7 | 67.1 | 65.8 | 70.8 | 85.7 | < 0.001 |
 % Male | 42.9 | 37.8 | 42.5 | 44.7 | 49.8 | 41.1 | < 0.001 |
 % Urban | 36.7 | 34.8 | 39.3 | 37.4 | 35.7 | 35.8 | 0.027 |
Socioeconomic factors | |||||||
 % 0 years of schooling | 63.5 | 66.9 | 59.2 | 59.6 | 60.8 | 70.0 | < 0.001 |
 % Economic independence | 25.8 | 25.1 | 31.1 | 30.7 | 26.0 | 17.8 | < 0.001 |
 % Professional occupation | 9.4 | 8.2 | 10.5 | 10.9 | 7.9 | 8.0 | < 0.001 |
 % Access to healthcare | 92.4 | 86.7 | 90.4 | 92.8 | 95.0 | 94.5 | < 0.001 |
Family/Social support | |||||||
 % Married | 32.7 | 32.0 | 37.0 | 38.2 | 36.8 | 23.3 | < 0.001 |
 % Close proximity to children | 87.3 | 84.3 | 86.9 | 87.1 | 88.1 | 88.7 | < 0.001 |
Health practice | |||||||
 % Doing regular exercise | 27.3 | 28.1 | 30.2 | 30.7 | 28.9 | 28.3 | < 0.001 |
 % Currently smoking | 17.9 | 16.9 | 19.4 | 18.6 | 18.8 | 16.5 | 0.016 |
Health condition | |||||||
 % ADL disabled | 20.6 | 21.5 | 18.4 | 14.3 | 13.0 | 31.2 | < 0.001 |
 % Cognitively impaired | 44.3 | 42.2 | 39.9 | 36.5 | 36.9 | 58.6 | < 0.001 |
 % Self-reported poor health | 51.1 | 67.9 | 59.1 | 47.9 | 44.2 | 46.6 | < 0.001 |