Table 1.
Characteristics of participants (N=2746)
| Factors | n % | Factors | n % |
| Profession | Mealtime | ||
| Doctor (visiting physician) | 167 (6.08) | Normal | 1232 (44.87) |
| Doctor (resident) | 191 (6.96) | Abnormal | 1514 (55.13) |
| Nurse | 1406 (51.20) | Eat out | |
| Medical technician | 367 (13.36) | Zero meal | 185 (6.74) |
| Administrative staff (supervisors) | 16 (0.58) | One meal | 663 (24.14) |
| Administrative staff (other) | 599 (21.81) | Two meals | 832 (30.30) |
| Age (years) | Three meals | 1066 (38.82) | |
| 21–34 | 1300 (47.34) | Lack of sleep | |
| 35–44 | 603 (21.96) | No | 1124 (40.93) |
| 45–54 | 625 (22.76) | Yes | 1622 (59.07) |
| 55–66 | 218 (7.94) | Workday sleep hours <6 hours | |
| Gender | Catch-up sleep hours ≤0 hours | 66 (2.40) | |
| Male | 589 (21.45) | Catch-up sleep hours >0 and ≤2 hours | 243 (8.85) |
| Female | 2157 (78.55) | Catch-up sleep hours >2 hours | 303 (11.03) |
| Length of service (years) | Workday sleep hours ≥6 and <7 hours | ||
| <5 | 944 (34.38) | Catch-up sleep hours ≤0 hours | 115 (4.19) |
| 5–14 | 685 (24.95) | Catch-up sleep hours >0 and ≤2 hours | 452 (16.46) |
| 15–24 | 523 (19.05) | Catch-up sleep hours >2 hours | 211 (7.68) |
| >24 | 443 (16.13) | Workday sleep hours ≥7 hours | |
| Missing | 151 (5.50) | Catch-up sleep hours ≤0 hours | 62 (2.26) |
| Marital status | Catch-up sleep hours >0 and ≤2 hours | 102 (3.71) | |
| Single | 1338 (48.73) | Catch up sleep hours >2 hours | 62 (2.26) |
| Married | 1341 (48.83) | Missing | 6 (0.22) |
| Divorced | 51 (1.86) | Physical exercise | |
| Widowed | 16 (0.58) | None | 1668 (60.74) |
| Body mass index | Regular | 1078 | |
| ≤24 | 1889 (68.79) | <90 min/week | 497 (18.10) |
| >24 | 820 (29.86) | ≥90 and <150 min/week | 289 (10.52) |
| Missing | 37 (1.35) | ≥150 min/week | 281 (10.23) |
| Smoking | Missing | 11 (0.40) | |
| No | 2702 (98.40) | Weekly work hours | |
| Yes | 26 (0.95) | 20–40 | 1131 (41.19) |
| Missing | 18 (0.66) | 41–60 | 1379 (50.22) |
| Betel nut usage | >60 | 229 (8.34) | |
| No | 2676 (97.45) | Missing | 7 (0.25) |
| Yes | 2 (0.07) | Lifestyle factors* | |
| Missing | 68 (2.48) | None | 105 (3.8) |
| Alcohol consumption | One | 369 (13.5) | |
| No | 2620 (95.41) | Two | 593 (21.7) |
| Yes | 126 (4.59) | Three | 736 (26.9) |
| Work type | Four | 734 (26.8) | |
| Day shift | 1775 (64.64) | Five | 202 (7.4) |
| Night shift | 184 (6.70) | ||
| Graveyard shift | 139 (5.06) | ||
| Rotating shift | 648 (23.60) |
*Lifestyle factors: abnormal meal times, frequently eat out, lack of sleep, no exercise, >40 weekly work hours.