| Included research | Random method | Blind method | Allocation concealment | Withdrawal and loss to follow-up | ITI analysis | Baseline comparability | Quality grade |
| Liu et al. [10] 2015 | unclear | single-blind | unclear | No | No | Yes | B |
| Elli et al. [11] 2016 | random number | unclear | unclear | Yes | No | Yes | B |
| Baldinelli et al. [12] 2015 | random number | single-blind | unclear | Yes | No | Yes | B |
| Lei Wenlan et al. [13] 2016 | unclear | unclear | unclear | Yes | No | Yes | B |
| Pan Longfang et al. [14] 2015 | random number | single-blind | Yes | Yes | Yes | Yes | A |
| Zhu Ya et al. [15] 2010 | sequential order of catheterization | unclear | unclear | No | No | Yes | B |
| Lin Cuifang et al. [16] 2015 | random number table | unclear | unclear | No | No | Yes | B |
| Zhang Ronghua et al. [17] 2015 | unclear | unclear | unclear | No | No | Yes | B |
| Zhou Lianqing et al. [18] 2013 | Hospitalization number | unclear | unclear | No | No | Yes | B |
| Zhuo Yajuan et al. [19] 2014 | random number table | unclear | unclear | No | No | Yes | B |
| Xu Mingming et al. [20] 2012 | unclear | unclear | unclear | No | No | Yes | B |
| Jiang Guichun et al. [21] 2016 | envelope method | unclear | unclear | No | No | Yes | B |
| Wang Chaohong et al. [22] 2016 | random number table | unclear | unclear | No | No | Yes | B |
| Li Xiangjun et al. [23] 2016 | unclear | unclear | unclear | No | No | Yes | B |
| Zheng Chunhua et al. [24] 2016 | unclear | unclear | unclear | Yes | No | Yes | B |
| Ren Xiaomin et al. [25] 2016 | random number table | unclear | unclear | No | No | Yes | B |