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Table 2 Characteristics of the patients after propensity score matching

From: Effect of forced-air warming by an underbody blanket on end-of-surgery hypothermia: a propensity score-matched analysis of 5063 patients

 

Under group

Control group

Standardized differencea

P value

Number

489

489

  

Age (years)

57 ± 21

57 ± 20

0%

0.861

Male / female

262 / 227

291 / 198

 

0.061

Height (cm)

158 ± 18

159 ± 15

6%

0.409

Weight (kg)

55 ± 17

57 ± 17

12%

0.779

ASA-PS

   

0.247

 1 /2

95 / 277

78 / 271

  

 3 / 4 / 5

110 / 7 / 0

129 / 11 / 0

  

Type of surgery

   

0.695

 Craniotomy

4

6

  

 ENT

51

53

  

 Thoracic

34

41

  

 Cardiovascular

67

84

  

 Endovascular aortic repair

17

19

  

 Abdominal (Laparoscopic)

69

70

  

 Abdominal (No laparoscopic)

155

143

  

 Surface of the trunk

33

26

  

 Orthopedic

21

21

  

 Spinal

29

22

  

 Unclassifiable

9

4

  

Type of warming method

   

0.659

 Over full cover

32

38

  

 Over upper cover

112

97

  

 Over lower cover

172

178

  

 Over right cover

2

1

  

 Over left cover

4

6

  

 Over heating cover

17

20

  

Duration of anesthesia (min)

403 ± 222

431 ± 347

8%

0.137

  1. Data are presented as numbers or means ± S.D. a: Standardized difference for a covariate is the mean difference between the groups divided by the S.D., converted into a percentage. The absolute differences in the mean values of the numerical cofounders included in the matching were less than 15% of the standard deviations