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Table 3 Binary logistic regression analysis

From: Effect of sedative premedication with oral midazolam on postanesthesia care unit delirium in older adults: a secondary analysis following an uncontrolled before-after design

  OR 95% CI P
First step
 Midazolam (reference: no midazolam) 0.720 0.128; 4.067 0.710
 Year of enrollment (per year increase) 0.805 0.429; 1.512 0.500
 Propofol (reference: sevoflurane) 2.653 1.395; 5.044 0.003
 ORP (reference: RARP) 1.061 0.583; 1.934 0.846
 Age (per year increase) 1.098 1.046; 1.152 < 0.001
 ASA physical status (reference: ASA III)
  ASA I 0.907 0.499; 1.649 0.749
  ASA II 1.286 0.595; 2.778 0.523
 Estimated blood loss (per ml increase) 1.165 0.828; 1.638 0.381
 Duration of surgery (per min increase) 2.028 0.657; 6.260 0.219
 Sufentanil (per μg kg−1 h−1 increase) 1.014 1.002; 1.025 0.018
Final step
 Midazolam (reference: no midazolam) 0.847 0.164; 4.367 0.842
 Year of enrollment (per year increase) 0.829 0.458; 1.499 0.535
 Propofol (reference: sevoflurane) 2.805 1.497; 5.256 0.001
 Age (per year increase) 1.102 1.050; 1.156 < 0.001
 Sufentanil (per μg kg−1 h−1 increase) 1.014 1.005; 1.024 0.004
  1. Factors associated with postanesthesia care unit delirium were analyzed with binary logistic regression. Variables were eliminated stepwise backwards with the first and the final step presented. ‘Midazolam’ and ‘year of enrollment’ were forced into the model. ‘Duration of surgery’ and ‘estimated blood loss’ were transformed to their binary logarithm (ln(x)/ln(2)). RARP robot-assisted radical prostatectomy. ORP open retropubic radical prostatectomy