Table 1 Baseline characteristics of studies included in the meta-analysis

Chen M, 201 8[18]

RCT

32

33

31

71.41 ± 7.52/ 70.92 ± 7.24/ 71.93 ± 7.05

48/48

14

600

80

LV/V/L

②④⑤⑥

3

Deng GJ,201 8[19]

RCT

40

40

40

47.3 ± 4.15/ 46.2 ± 5.89/ 47.8 ± 4.03

55/65

14

300

80

LV/V/L

①②

3

Huo Y, 201 4[20]

RCT

60

60

–

44.4 ± 4.2

57/63

14

600

80

LV/V

①④⑤⑥

4

Jiang ZY,201 9[21]

RCT

51

51

–

69.21 ± 3.54

59/43

14

600

80

LV/V

①③④

4

Li Y, 201 8[22]

RCT

43

43

–

63.21 ± 3.43/62.47 ± 3.65

52/34

14

600

80

LV/V

①②③

4

Lin XJ,201 3[23]

RCT

33

40

35

–

61/47

14

600

80

LV/V/L

①⑤⑥⑦

2

Ma L, 201 9[24]

RCT

48

48

–

57.26 ± 4.31/ 57.84 ± 3.92

56/40

14

600

80

LV/V

①③

4

Peng B, 201 3[25]

RCT

40

40

40

–

–

14

450

80

LV/V/L

①

3

Shi D, 201 8[26]

RCT

135

135

–

61.71 ± 2.52/ 61.56 ± 2.51

131/139

14

600

80

LV/V

①④⑤

3

Wen WB,201 9[27]

RCT

26

25

–

56 ± 11/56 ± 9

17/14

14

300

80

LV/V

①②

3

Zhao J, 201 7[28]

RCT

41

39

–

46.53 ± 13.35/45.78 ± 12.28

50/30

14

600

80

LV/V

①③④⑤⑥⑦

4