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Table 4 Multivariable logistic regression models for predicting the odds of using sleep aids, either inclusive or exclusive of alcohol.

From: The use of sleep aids among Emergency Medicine residents: a web based survey

   Sleep aids inclusive of alcohol Sleep aids exclusive of alcohol
   Odds Ratio 95% confidence interval Odds Ratio 95% confidence interval
Type of program PGY1–4 v PGY1–3 2.09 (1.17 – 3.72) 1.82 (1.03 – 3.22)
  PGY2–4 v PGY1–3 1.43 (0.81 – 2.53) 1.31 (0.75 – 2.30)
Causes of fatigue Work-related emotional stress 2.03 (1.35 – 3.04) 1.74 (1.15 – 2.64)
  Family commitments    1.41 (0.94 – 2.11)
Causes of difficulty initiating sleep Family commitments 1.76 (1.13 – 2.73)   
  Changing circadian rhythms 2.05 (1.33 – 3.16) 1.99 (1.28 – 3.08)
Age   0.95 (0.89 – 1.00)