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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)  
  1. Models were adjusted for age, sex, BMI, duration of shift work, weekly working hours, smoking status, alcohol consumption, and physical activity
  2. OR odds ratio, 95 % CI 95 % confidence interval, BMI, body mass index