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Table 4 Odds ratio and 95 % CI for poor sleep quality according to direction of shift rotation

From: Comparison of sleep quality based on direction of shift rotation in electronics workers

Direction of shift rotation

Number of participants

Cases of poor sleep quality

Age- and sex- adjusted OR (95 % CI)

Multivariate- adjusted OR (95 % CI)

Total

 Forward rotation

4238

1189

Reference

Reference

 Backward rotation

512

193

2.01 (1.64–2.47)

1.95 (1.58–2.41)

Male

 Forward rotation

1359

287

Reference

Reference

 Backward rotation

390

133

2.02 (1.57–2.59)

1.92 (1.47–2.49)

Female

 Forward rotation

2879

902

Reference

Reference

 Backward rotation

122

60

2.12 (1.48–3.05)

2.13 (1.47–3.08)

  1. Multivariable model 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