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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