Factors related to headaches among respondents with sleep problems (n=1846)
| Variable | Headache | P value | |
| Yes n=1097 (%) | No n=749 (%) | ||
| Work hours per week | 0.015 | ||
| ≥55 | 685 (62.4) | 429 (57.3) | |
| <55 | 412 (37.6) | 320 (42.7) | |
| Number of night shifts per month | 0.173 | ||
| 5 times or less | 525 (47.9) | 376 (50.2) | |
| More than 5 times | 572 (52.1) | 373 (49.8) | |
| Do exercise every day | <0.001 | ||
| Yes | 120 (10.9) | 113 (15.1) | |
| No | 977 (89.1) | 636 (84.9) | |
| Regular diet at work | <0.001 | ||
| Yes | 122 (11.12) | 130 (17.36) | |
| No | 975 (88.88) | 619 (82.64) | |
| Neck and shoulder pain | <0.001 | ||
| Yes | 880 (80.2) | 540 (72.1) | |
| No | 217 (19.8) | 209 (27.9) | |
| Lumbar and back pain | <0.001 | ||
| Yes | 833 (75.9) | 496 (66.2) | |
| No | 264 (24.1) | 253 (33.8) | |
| Knee pain | <0.001 | ||
| Yes | 498 (45.4) | 136 (18.2) | |
| No | 559 (54.6) | 613 (81.8) | |