Table 1 Demographics information of the Ansan (cohort 1) and Ansung (cohort 2) cohorts.
Ansan cohort (Cohort 1, discovery set) (N = 4,635, 52.4%) | Ansung cohort (Cohort 2, replication set) (N = 4,205, 47.6%) | Total (N = 8,840, 100.0%) | |
|---|---|---|---|
Age (years) | 49.1 ± 7.9 | 55.7 ± 8.7 | 52.2 ± 8.9 |
Women, no. (%) | 2,262 (48.8) | 2,396 (57.0) | 4,658 (52.7) |
BMI (kg/m2) | 24.7 ± 3.0 | 24.5 ± 3.3 | 24.6 ± 3.1 |
Occupation, no. (%) | |||
White collar | 1,658 (35.9) | 461 (11.1) | 2,119 (24.1) |
Blue collar | 338 (7.3) | 2,431 (58.4) | 2,769 (31.5) |
Housework | 1,535 (33.25) | 991 (23.8) | 2,526 (28.8) |
Self-aware sleep duration (h) | 6.6 ± 1.3 | 7.2 ± 1.4 | 6.8 ± 1.4 |
Time in bed (h) | 6.7 ± 1.3 | 7.3 ± 1.4 | 7.0 ± 1.4 |
Habitual sleep efficiency (%) | 98.6 ± 12.2 | 98.0 ± 12.9 | 98.3 ± 12.6 |
Sleep latency (min) | 18.7 ± 19.2 | 21.4 ± 22.1 | 19.9 ± 20.6 |
Epworth sleepiness scale | 6.1 ± 3.8 | 6.4 ± 4.2 | 6.2 ± 4.0 |
