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Table 2 Association between quality of sleep and shift work, and other factors

From: The relationship between quality of sleep and night shift rotation interval

Variables Crudea Adjustedb
ORc 95 % CId OR 95 % CI
Length of night–shift Cycle     
 Group A (6 weeks) 1   1  
 Group B (4 weeks) 1.456 1.171–1.811 1.419 1.134–1.777
 Group C (12 days) 2.348 1.852–2.977 2.238 1.737–2.882
Age     
 20–29 1   1  
 30–39 0.834 0.665–1.046 0.883 0.670–1.163
Obesity (BMI)     
 18.5–24.9 1   1  
  < 18.5 1.000 0.787–1.270 1.059 0.844–1.329
  ≥ 25.0 1.119 0.891–1.403 1.072 0.865–1.328
Smoking     
 No 1   1  
 Current 1.990 1.482–2.670 1.415 1.053–1.899
Alcohol consumption     
 No 1   1  
 Mild 1.193 0.987–1.443 1.133 0.948–1.354
 Moderate 1.611 1.314–1.976 1.418 1.170–1.720
Regular Exercise     
  < 3 times per weeks 1   1  
  ≥ 3 times per weeks 0.962 0.818–1.133 0.936 0.803–1.092
Job tenure     
  < 5 years 1   1  
 5–9 years 0.904 0.747–1.093 0.552 0.340–0.896
  ≥ 10 years 0.798 0.653–0.976 0.474 0.275–0.816
Job tenure (Shift work)     
  < 5 years 1   1  
 5–9 years 0.937 0.781–1.125 1.557 0.964–2.515
  ≥ 10 years 0.848 0.682–1.053 1.906 1.102–3.296
Sleep during working     
 Impossible 1   1  
 Possible 1.015 0.810–1.273 1.199 0.951–1.511
  1. aanalysised by simple logistic regression analysis
  2. badjusted by age, obesity, smoking, alcohol consumption, regular exercise, job tenure, shift work tenure, sleep during working
  3. codds ratio, dconfidence interval