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Table 4 Subgroup 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) 0.805 0.140; 4.620 0.808
 Year of enrollment (per year increase) 0.823 0.438; 1.566 0.563
 ORP (reference: RARP) 1.163 0.595; 2.169 0.700
 Age (per year increase) 1.103 1.044; 1.164 < 0.001
 ASA physical status (reference: ASA III)
  ASA I 0.872 0.435; 1.748 0.699
  ASA II 1.140 0.468; 2.776 0.772
 Estimated blood loss (per ml increase) 1.093 0.752; 1.588 0.642
 Duration of surgery (per min increase) 2.661 0.668; 10.597 0.165
 Sufentanil (per μg kg−1 h−1 increase) 1.010 0.996; 1.024 0.145
Final step
 Midazolam (reference: no midazolam) 1.240 0.241; 6.386 0.797
 Year of enrollment (per year increase) 0.933 0.513; 1.695 0.819
 Age (per year increase) 1.100 1.043; 1.161 < 0.001
 Duration of surgery (per min increase) 4.123 1.284; 13.241 0.017
  1. Subgroup analysis of 337 patients who received sevoflurane for anesthesia maintenance with postanesthesia care unit delirium as the dependent variable. ‘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