Studies | Region | Sequence generation | Allocation concealment | Blind | Outcome data | Selective outcome reporting | Other sources of bias | ITT | Risk of bias |
---|---|---|---|---|---|---|---|---|---|
Wang JW 2005[11] | Multi-center | Random number table (SAS) | Insufficient | Clear | No | No | Unclear | Yes | Low risk of bias |
Yang L 2005[12] | Multi-center | Random number table (SPSS) | Unclear | Unclear | Yes | No | Unclear | No | Unclear risk of bias |
Cai L 2007[13] | Single center | Random number table (SPSS) | Unclear | Clear | Yes | No | Unclear | No | Low risk of bias |
Mu HY 2009[14] | Single center | Random number table (SPSS) | Unclear | Clear | Yes | No | Unclear | No | Low risk of bias |
Liao HY 2009[15] | Single center | Random number table (SPSS) | Unclear | Unclear | Yes | No | Unclear | No | Unclear risk of bias |
Zhang T 2009[16] | Single center | Random number table (SPSS) | Unclear | Clear | Yes | No | Unclear | No | Low risk of bias |
Liu J 2009[17] | Single center | Random number table (SPSS) | Unclear | Unclear | Yes | No | Unclear | No | Unclear risk of bias |
Ma JB 2009[18] | Single center | Random number table (SPSS) | Unclear | Unclear | Yes | Yes | Unclear | No | Unclear risk of bias |
Shi GY 2009[19] | Multi-center | Random number table (SAS) | Unclear | Unclear | Yes | No | Unclear | No | Unclear risk of bias |
Han BH 2011[20] | Multi-center | Random number table (SPSS) | Insufficient | Clear | Yes | No | Unclear | No | Low risk of bias |
Zhao X 2011[21] | Single center | Random number table (SPSS) | Unclear | Clear | Yes | No | Unclear | No | Low risk of bias |
Hu HT 2011[22] | Single center | Random number table (SPSS) | Unclear | Unclear | Yes | No | Unclear | No | Unclear risk of bias |
Wen F 2011[23] | Single center | Random number table (SPSS) | Unclear | Unclear | Yes | No | Unclear | No | Unclear risk of bias |
Zhang H 2011[24] | Multi-center | unclear | Unclear | Unclear | Yes | No | Unclear | No | Unclear risk of bias |
Chen Q 2011[25] | Single center | Random number table (SPSS) | Unclear | Unclear | Yes | No | Unclear | No | Unclear risk of bias |