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Table 1 Characteristics of the patients before 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

1060

4003

  

Age (years)

57 ± 21

54 ± 21

14%

< 0.0001

Male / female

521 / 539

2054 / 1949

 

0.211

Height (cm)

155 ± 21

159 ± 14

19%

< 0.0001

Weight (kg)

55 ± 17

59 ± 17

24%

< 0.0001

ASA-PS

   

< 0.0001

 1 /2

175 / 642

1037 / 2176

  

 3 / 4 / 5

231 / 12 / 0

737 / 51 / 2

  

Type of surgery

   

< 0.0001

 Craniotomy

4

330

  

 ENT

82

1049

  

 Thoracic

66

205

  

 Cardiovascular

81

366

  

 Endovascular aortic repair

72

49

  

 Abdominal (laparoscopic)

164

404

  

 Abdominal (non-laparoscopic)

447

654

  

 Surface of the trunk

41

387

  

 Orthopedic

23

380

  

 Spinal

71

74

  

 Unclassifiable

9

105

  

Type of warming method

   

< 0.0001

 Over full cover

37

1333

  

 Over upper cover

124

1123

  

 Over lower cover

237

1652

  

 Over right cover

5

11

  

 Over left cover

6

17

  

 Over heating cover

20

263

  

Duration of anesthesia (min)

413 ± 231

307 ± 219

46%

< 0.0001

  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