2.
纳入研究方法学质量评价
Quality assessment of included studies
| Included studies | Randomization | Allocated concealment | Baseline | Lost of follow-up | ITT analysis |
| ITT: intention to treat | |||||
| Li HX 2007[5] | Unclear | Envelope | Compatibility | Yes（n=6） | No |
| Zhao QW 2007[6] | Unclear | Unclear | Compatibility | No | No |
| Li ZW 2007[7] | Unclear | Unclear | Compatibility | Yes（n=1） | No |
| Zhang XH 2009[8] | Random digits | Unclear | Compatibility | Unclear | No |
| Deng YN 2009[9] | Unclear | Unclear | Compatibility | Unclear | No |
| Ji N 2010[10] | Unclear | Unclear | Compatibility | Unclear | No |
| Qian YH 2007[11] | Unclear | Unclear | Compatibility | Unclear | No |
| Guo YX 2007[12] | Unclear | Unclear | Compatibility | Unclear | No |
| Dang YZ 2006[13] | Unclear | Unclear | Compatibility | Unclear | No |
| Zhang N 2008[14] | Unclear | Unclear | Compatibility | Unclear | No |
| Han JQ 2004[15] | Unclear | Unclear | Compatibility | Unclear | No |
| Liu YC 2007[16] | Unclear | Unclear | Compatibility | Yes（n=2） | No |
| Liu JM 2010[17] | Random digits | Unclear | Compatibility | Unclear | No |
| Jia JH 2008[18] | Admission order random | Unclear | Compatibility | Unclear | No |
| An YM 2008[19] | Unclear | Unclear | Compatibility | Unclear | No |
| Chen MC 2009[20] | Unclear | Unclear | Compatibility | Unclear | No |
| Chen RX 2006[21] | Random digits | Unclear | Compatibility | Unclear | No |
| Wang TJ 2008[22] | Unclear | Envelope | Compatibility | No | No |
| Wang JC 2009[23] | Unclear | Unclear | Compatibility | Unclear | No |
| Gao HF 2011[24] | Random digits | Unclear | Compatibility | Unclear | No |
| Song X 2006[25] | Unclear | Unclear | Compatibility | Unclear | No |