Table 2 Quality evaluation of included studies
Studies | Jadad Scores | Weaknesses |
|---|---|---|
Bao et al. 2005 [15] | 2 | NR, NF |
Cao et al. 2013 [16] | 2 | NR, NF |
Chen et al. 2013 [17] | 2 | NR, NF |
Chen et al. 2016 [18] | 2 | SS, NR, NF |
Duan et al. 2010 [19] | 2 | SS |
Guo et al. 2005 [20] | 2 | NR, NF |
Hou et al. 2018 [21] | 2 | NR, NF |
Jiang et al. 2010 [22] | 2 | NR, NF |
Li et al. 2006 [23] | 1 | NR, NF |
Li et al. 2008 [24] | 1 | NR, NF |
Li et al. 2009 [25] | 2 | NR, NF |
Li et al. 2011 [6] | 1 | NR, NF |
Tao et al. 2014 [26] | 2 | SS, NR, NF |
Wang et al. 2006 [27] | 3 | NR |
Wang et al. 2012 [28] | 1 | NR, NF |
Wu et al. 2001 [29] | 1 | SS, NR, NF |
Zhang Z et al. 2005 [31] | 1 | NR, NF |
Zhang S et al. 2005 [30] | 2 | NR, NF |
Zhang et al. 2017 [32] | 2 | NR, NF |
Zhao et al. 2008 [34] | 2 | SS, NR, NF |
Zhao et al. 2006 [33] | 2 | NR, NF |
Zhou et al. 2003 [35] | 1 | NR, NF |
Zhu et al. 2006 [36] | 2 | SS, NR, NF |
Zou et al. 2009 [37] | 1 | NR, NF |