Table 2 Subgroup analyses for investigated outcomes

Hypothermia in maternal

Anesthesia

Spinal

0.75 (0.55–1.02)

0.065

39.1

0.177

Other

0.75 (0.51–1.08)

0.124

41.5

0.181

Temperature site

Oral

0.82 (0.65–1.05)

0.114

31.1

0.226

Other

0.66 (0.46–0.96)

0.029

28.8

0.245

Study quality

High

0.71 (0.54–0.94)

0.017

38.9

0.147

Low

0.86 (0.68–1.07)

0.170

–

–

Shivering in maternal

Anesthesia

Spinal

0.58 (0.38–0.88)

0.011

0.0

0.434

Other

0.52 (0.18–1.52)

0.233

63.5

0.065

Temperature site

Oral

0.79 (0.44–1.42)

0.432

0.0

0.431

Other

0.47 (0.28–0.81)

0.006

30.4

0.207

Study quality

High

0.56 (0.32–0.97)

0.037

29.0

0.228

Low

0.52 (0.23–1.19)

0.122

46.0

0.157

Temperature in maternal

Anesthesia

Spinal

0.18 (0.06 to 0.31)

0.004

52.6

0.077

Other

0.42 (0.10 to 0.75)

0.011

91.0

< 0.001

Temperature site

Oral

0.16 (0.07 to 0.24)

< 0.001

42.2

0.140

Other

0.52 (0.06 to 0.97)

0.025

89.3

< 0.001

Study quality

High

0.39 (0.11 to 0.66)

0.006

86.5

< 0.001

Low

0.16 (0.09 to 0.23)

< 0.001

4.2

0.352

Temperature in newborn

Anesthesia

Spinal

0.22 (−0.19 to 0.62)

0.295

95.3

< 0.001

Other

0.53 (−0.16 to 1.21)

0.132

90.1

0.001

Temperature site

Oral

0.22 (−0.19 to 0.62)

0.295

95.3

< 0.001

Other

0.53 (−0.16 to 1.21)

0.132

90.1

0.001

Study quality

High

0.53 (0.07 to 1.00)

0.025

95.6

< 0.001

Low

−0.10 (−0.29 to 0.10)

0.325

50.0

0.157

Umbilical vein PH

Anesthesia

Spinal

−0.01 (−0.02 to − 0.00)

0.009

26.2

0.254

Other

0.08 (0.03 to 0.13)

0.002

–

–

Temperature site

Oral

−0.01 (−0.04 to 0.02)

0.511

52.5

0.147

Other

0.01 (−0.03 to 0.05)

0.777

86.0

0.001

Study quality

High

0.00 (−0.02 to 0.03)

0.784

79.7

0.002

Low

−0.03 (−0.06 to − 0.00)

0.040

–

–