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Table 3 Characteristics and perioperative data before and after propensity score matching of ASA-PS 2 and 3 patients

From: Effect of the preoperative physical status on postoperative nausea and vomiting risk: a matched cohort study

  Before matching After matching
ASA PS 2 (n = 82,822) ASA PS 3 (n = 24,785) ASD ASA PS 2 (n = 23,530) ASA PS 3 (n = 23,530) ASD
Young age (< 50) 32,061 (38.7) 2866 (11.6) 0.85 3038 (12.9) 2862 (12.2) 0.02
Female 42,983 (51.9) 11,556 (46.6) 0.11 10,975 (46.6) 11,078 (47.1) 0.01
Obesity 8913 (10.8) 2048 (8.3) 0.09 2028 (8.6) 1976 (8.4) 0.01
Smoking 14,761 (17.8) 3358 (13.5) 0.12 3345 (14.2) 3264 (13.9) 0.01
Menstruation 43 (0.1) 5 (0.0) 0.02 6 (0.0) 5 (0.0) 0
Levin tube 1499 (1.8) 929 (3.7) 0.1 784 (3.3) 784 (3.3) 0
General anesthesia 69,513 (83.9) 22,331 (90.1) 0.21 21,088 (89.6) 21,078 (89.6) 0
Inhalation anesthetics 64,464 (77.8) 20,346 (82.1) 0.11 19,249 (81.8) 19,253 (81.8) 0
N2O 7500 (9.1) 1518 (6.1) 0.12 1498 (6.4) 1501 (6.4) 0
Remifentanil 49,275 (59.5) 18,580 (75.0) 0.36 17,401 (74.0) 17,349 (73.7) 0.01
Steroid 3647 (4.4) 1204 (4.9) 0.02 1090 (4.6) 1082 (4.6) 0
Neostigmine 17,197 (20.8) 9153 (36.9) 0.33 8146 (34.6) 8159 (34.7) 0
Anticholinergics 68,716 (83.0) 21,336 (86.1) 0.09 20,284 (86.2) 20,186 (85.8) 0.01
Antiemetics 64,851 (78.3) 21,357 (86.2) 0.23 20,213 (85.9) 20,140 (85.6) 0.01
Laparoscopic surgery 17,392 (21.0) 4524 (18.3) 0.07 4374 (18.6) 4350 (18.5) 0
Abdominal surgery 15,353 (18.5) 5306 (21.4) 0.07 4868 (20.7) 4934 (21.0) 0.01
GY surgery 8713 (10.5) 746 (3.0) 0.44 794 (3.4) 743 (3.2) 0.01
EYE surgery 1072 (1.3) 275 (1.1) 0.02 262 (1.1) 274 (1.2) 0
ENT surgery 8139 (9.8) 1361 (5.5) 0.19 1368 (5.8) 1361 (5.8) 0
Head and neck surgery 4149 (5.0) 830 (3.3) 0.09 816 (3.5) 825 (3.5) 0
Anesthesia time (h) 1.8 (1.1, 2.7) 2.1 (1.3, 3.1) 0.25 1.9 (1.3, 3.1) 2.0 (1.3, 3.0) 0
Recovery room time (h) 0.5 (0.5, 6.0) 0.6 (0.4, 0.7) 0.09 0.6 (0.5, 0.6) 0.6 (0.4, 0.7) 0.01
NPO time (h) 11.2 (8.8, 13.6) 11.3 (8.8, 13.7) 0.01 11.2 (8.8, 13.7) 11.2 (8.8, 13.7) 0
Input and output (ml/kg) 6.0 (3.5, 10.0) 8.1 (4.4, 14.5) 0.28 7.3 (4.3, 12.4) 7.7 (4.3, 13.6) 0.01
Opioid in OR and RR (mg/kg) 4.0 (0.2, 5.8) 2.8 (0.0, 5.0) 0.29 3.1 (0.0, 5.0) 2.8 (0.0, 5.0) 0.03
Opioid after RR (mg/kg) 0.0 (0.0, 94.3) 36.1 (0.0, 175.8) 0.22 0.0 (0.0, 165.0) 32.1 (0.0, 166.7) 0.01
  1. Values are number (percentages) or median (interquartile ranges)
  2. ASA American Society of Anesthesiologists, PS physical status, GY gynecology, ENT otorhinolaryngology, NPO nothing by mouth, OR operation room, RR recovery room, ASD absolute standardized differences