Table 2 Baseline characteristics of 629 patients in the eight included studies

Ages, weight (median) and sex (no)

Procedure characteristics (min)

Author and publication year

Age

Male

Female

Weight (kg)

Surgery duration (min)

Anaesthesia duration (min)

D

C

D

C

D

C

D

C

D

C

D

C

Ramlan and Mahri [12]

3.00 (1.00–9.00)

5.00 (1.00–10.00)

16

15

16

17

13.00 (6.00–32.00)

18.00 (8.00–35.00)

N/A

60.17 ± 17.88

58.33 ± 19.31

Sen et al. [13]

3.77 (1–6)

3.42 (1–6)

27

23

13

17

14.5 (6–25)

13.7 (5–30)

19.5 ± 3.89

19 ± 

4.11

29.88 ± 4.36

29.18 ± 4.21

Chu and Wang, [14]

4.73

4.7

31

36

39

36

N/A

N/A

N/A

Elghamry and Elkeblawy [15]

4.65 ± 1.43

5.06 ± 1.37

11

14

23

19

17.1 ± 2.93

18.1 ± 2.88

49.6 ± 11.03

51.8 ± 9.64

59.8 ± 10.78

62.5 ± 9.63

Oriby et al. [16]

6.6 ± 2.5

5.8 ± 2.3

25

20

17

22

31 ± 12

29 ± 11

N/A

N/A

Jangra et al. [17]

5.4 ± 2.0

5.5 ± 2.2

38

37

22

23

18.6 ± 5.7

17.5 ± 5.0

46.5 ± 2.3

47.1 ± 8.3

60.4 ± 3.5

60.3 ± 6.3

Li et al. [18]

8.25 ± 1.06

8.24 ± 1.32

20

24

20

17

N/A

22.70 ± 6.61

23.43 ± 7.86

32.53 ± 8.21

31.70 ± 7.58

Yao et al. [19]

4.9 ± 0.9

4.5 ± 1.0

30

37

22

14

19.3 ± 3.1

19.3 ± 4.2

44.0 ± 2.7

44.1 ± 3.3

84.3 ± 4.4

85.6 ± 4.5