Table 2 Summary of parameters for the intervention and control groups for the key studies

Zhou et al. 2006 [11]

109

11

153

109

11

149

Parsons et al. 2008 [20]

8.6

6.3

132

9.2

5.9

132

Li et al. 2009 [27]

102.44

4.475

438

102.65

4.42

471

Chang et al. 2013 [26]

100.2

15.7

466

98

15.3

384

Li et al. 2015 [28]

88.98

12.69

562

89.82

14.07

604

Christian et al. 2010 [12]

51.7

8.5

103

48.2

10.2

177

Angulo Barroso et al. 2016 [18]

87.5

0.95

298

87.4

0.95

288