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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