Table 3.
Cochrane’s risk of bias
| Source of bias | Random sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Other source of bias |
|---|---|---|---|---|---|---|---|
| Ling (2003)
[33] |
U |
U |
U |
U |
L |
U |
U |
| Ramachandran (2004)
[34] |
U |
U |
U |
U |
L |
U |
U |
| Derosa (2004)
[35] |
U |
U |
U |
U |
L |
U |
U |
| Gonzolez (2004)
[36] |
U |
L |
L |
L |
L |
U |
U |
| Rong (2004)
[22] |
U |
U |
U |
U |
L |
U |
U |
| Tang (2004)
[37] |
U |
U |
U |
U |
L |
U |
U |
| Yamanouchi (2005)
[20] |
L |
L |
L |
U |
L |
U |
U |
| Ning (2006)
[38] |
U |
U |
U |
U |
L |
U |
U |
| Wu (2007)
[39] |
U |
U |
U |
U |
L |
U |
U |
| Xu (2007)
[40] |
U |
U |
U |
U |
L |
U |
U |
| Li (2007)
[41] |
U |
U |
U |
U |
L |
U |
U |
| Wang (2009)
[21] |
U |
U |
U |
U |
L |
U |
U |
| Rahman (2011)
[42] |
U |
U |
U |
U |
L |
U |
U |
| Yoon (2011)
[21] |
U |
U |
U |
U |
L |
U |
U |
| Wang (2011) [43] | U | U | U | U | L | U | U |
Note: L, low risk of bias; U, unclear risk of bias; H, high risk of bias.