Table 2.
Participant Characteristics (n = 2,450).
| Characteristics | Category | No sleep problems (n = 1,978), n (%) | Sleep problems (n = 472), n (%) | p-Value | ES |
|---|---|---|---|---|---|
| Age group (years) | 20s | 456 (23.1) | 115 (24.4) | 0.56a | 0.035b |
| 30s | 597 (30.2) | 131 (27.8) | |||
| 40s | 510 (25.8) | 122 (25.8) | |||
| 50s | 328 (16.6) | 76 (16.1) | |||
| 60s | 87 (4.4) | 28 (5.9) | |||
| BMI (kg/m2), mean (SD) | 22.36 (3.63) | 22.22 (3.75) | 0.45c | 0.039d | |
| BMI category | Underweight (<18.5) | 195 (9.9) | 53 (11.2) | 0.73a | 0.023b |
| Normal (18.5-24.9) | 1,389 (70.2) | 328 (69.5) | |||
| Overweight (25.0-29.9) | 320 (16.2) | 71 (15.0) | |||
| Obese (≥30) | 74 (3.7) | 20 (4.2) | |||
| Job category | Nurse | 491 (24.8) | 170 (36.0) | <0.001a | 0.13b |
| Administrative staff | 449 (22.7) | 116 (24.6) | |||
| Research staff | 451 (22.8) | 89 (18.9) | |||
| Co-medical staff | 292 (14.8) | 64 (13.6) | |||
| Physician | 215 (10.9) | 20 (4.2) | |||
| Dentist | 80 (4.0) | 13 (2.8) |
Note: Differences were considered significant at p < 0.05.
achi-square test.
bCramér’s V.
cStudent’s t test.
dCohen’s d.
BMI: body mass index; ES: effect size; SD: standard deviation.