Table 3.

Quality assessment of the trials included in the meta-analysis.

Study	Random sequence generation (selection bias)	Allocation concealment (selection bias)	Blinding of personnel	Blinding of patients	Follow-up/ integrity of cases	Incomplete outcome data (attrition bias)	Score	Risk of bias
Qixin Zhang [18]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Yinjuan Huang [19]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Changfeng Zhang [20]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Lianfen Bai [21]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Lin Li [22]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Haiying Lu [23]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Cuilan Zhou [24]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Ting Zhu [25]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Huiqiang Yu [26]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Xinyan Liu [27]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Yan Jiang [28]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Min Song [29]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Cuilian Feng [30]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Anxing Liu [31]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Yueping Deng [32]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Chunyan Zhang [33]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Rong Li [34]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Shizhen Zhong [35]	Random odd-even number	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Fang Liu [36]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Guihua Liu [37]	Random number table	Low	Unclear	Unclear	Low	Low	4	Unclear
Zhimin Xu [38]	Random number table	Low	Unclear	Unclear	Low	Low	4	Unclear
Rui Chen [39]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Qiulian Deng [40]	Random	Unclear	Unclear	Unclear	Low	Low	3	Unclear
Xuezhen Zhang [41]	Random	Unclear	Unclear	Unclear	Low	High	2	High
Hong Chen [42]	Random number table	Low	Unclear	Unclear	Low	Low	4	Unclear