Table 2 Assessment of the methodological quality for individual trials
Studies year* | Randomization | Allocation concealment | Blinding | Loss to follow-up | ITT analysis |
|---|---|---|---|---|---|
Sun 2007 [24] | yes | unclear | unclear | no | unclear |
Ge 2011 [25] | yes | unclear | unclear | no | unclear |
Peng 2011 [26] | yes | unclear | yes | no | unclear |
Niu 2008 [27] | yes | unclear | yes | no | unclear |
Gao 2005 [28] | yes | unclear | unclear | no | unclear |
Xu 2011 [29] | yes | unclear | unclear | no | unclear |
Bi 2003 [30] | yes | unclear | unclear | no | unclear |
Wang 2009 [31] | yes | unclear | unclear | no | unclear |
Xu LJ 2002 [32] | yes | unclear | unclear | no | unclear |
Liu 2008 [33] | yes | unclear | unclear | no | unclear |
Zhang 2002 [34] | yes | unclear | unclear | no | unclear |
Lu 2007 [35] | yes | unclear | unclear | no | unclear |
Zhu 2003 [36] | yes | unclear | unclear | no | unclear |
Liang 2005 [37] | yes | unclear | unclear | no | unclear |
Yuan 2008[38] | yes | unclear | unclear | no | unclear |
Wang GF 2008 [39] | yes | unclear | unclear | no | unclear |
Zhang SL 2008 [40] | yes | unclear | unclear | no | unclear |
Zhang XY 2008 [41] | yes | unclear | unclear | no | unclear |
Wu 2010 [42] | yes | unclear | unclear | no | unclear |
Li 2009 [43] | yes | unclear | unclear | no | unclear |
Feng 2005 [44] | yes | unclear | unclear | no | unclear |