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Baseline characteristics of all participants*
| Employment duration (years) | ≤ 5 | 6–10 | 16–20 | 21–25 | 26+ |
| 12 (2.4) | 19 (3.8) | 183 (36.6) | 150 (30) | 136 (27.2) | |
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| Age groups (years) | 25–34 | 35–44 | 45–54 | 55+ | |
| 23 (4.6) | 106 (21.2) | 313 (2.6) | 58 (11.6) | ||
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| Work Shift | Day worker | Routine shift worker | Weekly shift worker | ||
| 271 (54.2) | 204 (40.8) | 25 (5) | |||
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| Educational level (years) | < 12 | 12–16 | 16+ | ||
| 105 (21) | 390 (78) | 5 (1) | |||
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| Marital Status | Single | Married | |||
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| 13 (2.6) | 487 (97.4) | ||||
Data is expressed as N (%).
