Table 7 Cochrane risk of bias assessment
1st Author (year) | Random sequence generation | Allocation concealment | Blinding of participants, personnel, and outcome assessors | Complete collection and reporting of outcome data | Selective outcome reporting | Other sources of bias |
|---|---|---|---|---|---|---|
Chen (2010) [30] | Unclear | Unclear | High | Low | Low | Low |
Davidson (2001) [18] | Low | Unclear | High | Low | Low | Low |
Fink (2002) [15] | Low | Unclear | Low | Low | Low | Low |
Grua (1999) [19] | Unclear | Unclear | High | Low | Low | Low |
Irnich (2003) [17] | High | High | Low | Low | Low | High |
Jin (2005) [33] | Unclear | Unclear | High | Low | Low | Low |
Li (1998) [28] | Unclear | Unclear | High | Low | Low | Unclear |
Li (2007) [22] | Unclear | Unclear | High | Low | Low | Low |
Liu (2008) [23] | Unclear | Unclear | High | Low | Low | Unclear |
Lin (2011) [21] | Unclear | Unclear | High | Low | Low | Low |
Molsberger (1994) [16] | Unclear | Unclear | High | Low | Low | Low |
Shen (1999) [20] | Unclear | Unclear | High | Low | Low | Unclear |
Wang (2007) [24] | High | High | High | Low | Low | Low |
Wang (2008) [25] | Unclear | Unclear | High | Low | Low | Low |
Wu (2003) [26] | Unclear | Unclear | High | Low | Low | Low |
Xu (2010) [29] | Unclear | Unclear | High | Low | Low | Unclear |
Zha (2004) [31] | Low | Unclear | High | Low | Low | Low |
Zhang (2007) [32] | Low | High | High | Low | Low | Low |
Zhao (2003) [27] | High | High | High | Low | Low | Unclear |