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Table 3 Multivariate analysis

From: The length of stay in the post-anaesthesia care unit correlates with pain intensity, nausea and vomiting on arrival

  Length of stay Postoperative pain Postoperative nausea Postoperative vomiting
Independent variables ß ß OR 95% CI OR 95% CI
Gender 0.008 0.055** 2.455** 1.783/3.382 3.194** 1.755/5.816
Age 0.036** −0.148** 0.988* 0.979/0.998 0.992 0.974/1.009
ASA classification 0.159** 0.062** 1.101 0.859/1.410 0.915 0.593/1.414
Surgical specialities       
 General surgery −0.047 0.074* 0.511 0.232/1.126 0.584 0.138/2.467
 Cardiac surgery 0.058** 0.062** 0.411 0.128/1.325 0.781 0.091/6.678
 Orthopaedic surgery −0.021 0.099** 0.583 0.223/1.525 0.853 0.162/4.484
 Spine surgery 0.058** 0.014 0.450 0.168/1.206 0.716 0.133/3.853
 Urology −0.073** −0.015 0.015 0.979/0.998 0.530 0.093/3.036
 Ophthalmology −0.126** −0.073** 0.299* 0.107/0.834 0.250 0.034/1.856
 ENT surgery −0.071** −0.036** 0.689 0.170/2.792 n.a. n.a.
Anaesthetic technique       
 MAC −0.055** 0.028* 3.825* 1.172/12.485 0.813 0.090/7.330
 RA −0.001 −0.046** 2.675* 1.047/6.830 0.422 0.049/3.653
 General anaesthesia 0.041** 0.104** 1.365 0.708/2.633 0.607 0.251/1.468
Combined anaesthesia 0.031* 0.010 1.101 0.514/2.359 0.647 0.226/1.851
Duration of anaesthesia 0.432** 0.144** 1.003** 1.001/1.005 1.003 1.000/1.006
Postoperative pain 0.051** n.a. 1.161** 1.084/1.244 1.224* 1.099/1.363
Postoperative nausea/vomiting 0.025** n.a. n.a. n.a. n.a. n.a.
  1. To calculate predictors for length of PACU stay and postoperative pain, linear multiple regression analysis (displaying ß-weight = standardized coefficient) was used; to calculate predictors for postoperative nausea and vomiting, logistic regression analysis (displaying OR = odds ratio, 95% CI = 95% confidence interval) was used.
  2. ASA classification American Society of Anesthesiologists’ classification, ENT ear-nose-throat, MAC monitored anaesthesia care, n.a. not applicable, RA regional anaesthesia (peripheral and central neuraxial).
  3. *p <0.05, **p <0.001.