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Table 1 Characteristics and perioperative data before and after propensity score matching of ASA-PS 1 and 2 patients

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

  Before matching After matching
ASA PS 1 (n = 55,893) ASA PS 2 (n = 82,822) ASD ASA PS 1 (n = 43,400) ASA PS 2 (n = 43,400) ASD
Young age (< 50) 41,342 (74.0) 32,061 (38.7) 0.72 28,849 (66.5) 27,588 (63.6) 0.06
Female 28,933 (51.8) 42,983 (51.9) 0 22,588 (52.0) 22,727 (52.4) 0.01
Obesity 2462 (4.4) 8913 (10.8) 0.21 2462 (5.7) 2728 (6.3) 0.02
Smoking 11,801 (21.1) 14,761 (17.8) 0.09 8899 (20.5) 8764 (20.2) 0.01
Menstruation 93 (0.2) 43 (0.1) 0.05 38 (0.1) 39 (0.1) 0
Levin tube 243 (0.4) 1499 (1.8) 0.1 243 (0.6) 330 (0.8) 0.02
General anesthesia 46,047 (82.4) 69,513 (83.9) 0.04 35,489 (81.8) 35,856 (82.6) 0.02
Inhalation anesthetics 42,782 (76.5) 64,464 (77.8) 0.03 32,768 (75.5) 33,234 (76.6) 0.03
N2O 5947 (10.6) 7500 (9.1) 0.06 4182 (9.6) 3984 (9.2) 0.02
Remifentanil 24,888 (44.5) 49,275 (59.5) 0.3 22,877 (52.7) 23,421 (54.0) 0.03
Steroid 2285 (4.1) 3647 (4.4) 0.02 1771 (4.1) 1768 (4.1) 0
Neostigmine 7546 (13.5) 17,197 (20.8) 0.18 7414 (17.1) 8037 (18.5) 0.04
Anticholinergics 45,809 (82.0) 68,716 (83.0) 0.03 35,234 (81.2) 35,563 (81.9) 0.02
Antiemetics 41,048 (73.4) 64,851 (78.3) 0.12 32,232 (74.3) 32,482 (74.8) 0.01
Laparoscopic surgery 14,841 (26.6) 17,392 (21.0) 0.14 10,288 (23.7) 10,286 (23.7) 0
Abdominal surgery 11,133 (19.9) 15,353 (18.5) 0.04 7965 (18.4) 8027 (18.5) 0
GY surgery 7756 (13.9) 8713 (10.5) 0.11 6083 (14.0) 6011 (13.9) 0.01
EYE surgery 438 (0.8) 1072 (1.3) 0.05 416 (1.0) 443 (1.0) 0.01
ENT surgery 7819 (14.0) 8139 (9.8) 0.14 5193 (12.0) 5150 (11.9) 0
Head and neck surgery 2553 (4.6) 4149 (5.0) 0.02 2185 (5.0) 2237 (5.2) 0.01
Anesthesia time (h) 1.4 (1.0, 2.2) 1.8 (1.1, 2.7) 0.25 1.5 (1.0, 2.3) 1.6 (1.1, 2.3) 0.03
Recovery room time (h) 0.5 (0.4, 0.6) 0.5 (0.5, 6.0) 0.13 0.5 (0.4, 0.6) 0.5 (0.4, 0.6) 0.02
NPO time (h) 11.5 (9.2, 14.0) 11.2 (8.8, 13.6) 0.11 11.3 (9.0, 13.8) 11.3 (9, 13.8) 0.01
Input and output (ml/kg) 5.2 (3.2, 8.2) 6.0 (3.5, 10.0) 0.19 5.5 (3.4, 8.7) 5.5 (3.3, 9.0) 0.02
Opioid in OR and RR (mg/kg) 5.0 (0.3, 7.5) 4.0 (0.2, 5.8) 0.09 4.0 (0.2, 6.3) 4.0 (0.0, 6) 0
Opioid after RR (mg/kg) 0.0 (0.0, 47.3) 0.0 (0.0, 94.3) 0.18 0.0 (0.0, 66.9) 0.0 (0.0, 73.5) 0.03
  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