Table 1. Baseline sample characteristics.
| Stayed in 8-hour shift system (n=95) |
Changed from 8-hour to 12-hour shift system (n=83) |
p-value 1 | |
| Age (Mean, SD) | 44.2, ± 10.0 | 41.4, ± 9.9 | 0.069 |
| Years of shift work experience (Mean, SD) | 20.0, ± 11.6 | 17.2, ± 10.9 | 0.109 |
| BMI (kg/m2) (Mean, SD) | 26.7, ± 4.1 | 26.8, ± 3.6 | 0.916 |
| Sex (males) (%) | 89.5 | 91.6 | 0.636 |
| Children under 18 years (%) 2 | 49.5 | 59.0 | 0.202 |
| Evening Chronotype (%) 3 | 60.0 | 66.1 | 0.388 |
| Use of hypnotics or other sleep promoting substances (%) 4 | 20.0 | 16.9 | 0.592 |
| Habitual sleep length (hh:mm) (Mean, SD) | 07:16, ± 0.82 | 07:20, ± 0.99 | 0.646 |
| Subjective health (%) 5 | 61.4 | 70.1 | 0.201 |
| Need for recovery from work (NFR) (%) 6 | 72.2 | 70.0 | 0.795 |
1t-test or Pearson Chi-square. 2Living in the same household. 3More evening type or absolutely evening type.
4Weekly or more often. 5Good subjective health (good or very good). 6Increased need for recovery (6> points).