Table 5 Odds ratio and 95 % CI for poor sleep quality based on direction of shift rotation in subgroups
From: Comparison of sleep quality based on direction of shift rotation in electronics workers
| Subgroup | Forward rotation | Backward rotation | P value for interaction |
|---|---|---|---|
| Age (years) | <0.001 | ||
| <30 | Reference | 1.89 (1.46–2.45) | |
| ≥30 | Reference | 2.60 (1.77–3.83) | |
| BMI (kg/m2) | 0.423 | ||
| 18.5–24.9 | Reference | 1.84 (1.42–2.40) | |
| <18.5 | Reference | 2.56 (1.10–5.96) | |
| ≥25 | Reference | 2.19 (1.48–3.24) | |
| Duration of shift work | 0.197 | ||
| <5 years | Reference | 1.78 (1.34–2.36) | |
| 5–9 years | Reference | 2.48 (1.63–3.77) | |
| ≥10 years | Reference | 2.07 (1.19–3.60) | |
| Weekly working hours | 0.417 | ||
| <41 h | Reference | 1.73 (1.03–2.88) | |
| 41–51 h | Reference | 1.96 (1.48–2.59) | |
| ≥52 h | Reference | 1.82 (1.19–2.79) | |
| Smoking status | 0.566 | ||
| Non-smoker | Reference | 1.95 (1.51–2.53) | |
| Ex-smoker | Reference | 1.99 (1.38–2.88) | |
| Current smoker | Reference | 5.36 (0.43–67.26) | |
| Alcohol consumption | 0.508 | ||
| Non-drinker | Reference | 1.76 (1.20–2.58) | |
| Regular drinker | Reference | 1.91 (1.46–2.49) | |
| Heavy drinker | Reference | 3.32 (1.55–7.13) | |
| Physical activity | 0.427 | ||
| Sufficient exercise | Reference | 1.97 (1.40–2.78) | |
| Insufficient exercise | Reference | 1.94 (1.49–2.53) |