Variables | Cases n (%) | Controls n (%) | Total n (%) | P value |
Total | ||||
Night shift work history | 0.001 | |||
Yes | 122 (24.65) | 172 (35.98) | 294 (30.22) | |
No | 373 (75.35) | 306 (64.02) | 679 (69.78) | |
Types of shift work | <0.001 | |||
Permanent night shift | 4 (0.81) | 2 (0.42) | 6 (0.62) | |
Rotating night shift | 79 (15.96) | 128 (26.78) | 207 (21.27) | |
Irregular night shift | 39 (7.88) | 42 (8.79) | 81 (8.32) | |
No | 373 (75.35) | 306 (64.02) | 679 (69.78) | |
Years of night shift work | <0.001 | |||
≤1 | 8 (1.62) | 14 (2.93) | 22 (2.26) | |
2–5 | 37 (7.47) | 52 (10.88) | 89 (9.15) | |
6–10 | 28 (5.66) | 52 (10.88) | 80 (8.22) | |
≥11 | 49 (9.90) | 54 (10.48) | 103 (10.59) | |
No | 373 (75.35) | 306 (64.02) | 679 (69.78) | |
Work posture | <0.001 | |||
Majority sitting, and sometimes standing or walking | 264 (53.33) | 313 (65.48) | 577 (59.30) | |
Comparable sitting and standing | 118 (23.84) | 104 (21.76) | 222 (22.82) | |
Majority standing or walking, and sometimes sitting | 113 (22.83) | 61 (12.76) | 174 (17.88) | |
Working hours per day | 0.191 | |||
<2 | 24 (4.85) | 9 (1.88) | 33 (3.39) | |
2–4 | 30 (6.06) | 20 (4.18) | 50 (5.14) | |
5–7 | 131 (26.46) | 157 (32.85) | 288 (29.6) | |
≥8 | 310 (62.63) | 292 (61.09) | 602 (61.87) | |
Industrial dust | 0.001 | |||
Yes | 450 (90.91) | 460 (96.23) | 910 (93.53) | |
No | 45 (9.09) | 18 (3.77) | 63 (6.47) | |
High temperature at the office | 0.003 | |||
Yes | 467 (94.34) | 469 (98.12) | 936 (96.20) | |
No | 28 (5.66) | 9 (1.88) | 37 (3.80) |