Table 2: Quality assessment of included trials.

No.TrialsRandom allocationAllocation concealmentBlindingLoss to follow-upJadad score

1KUANG Heng (2014)21115

2AN Yuan et al. (2014)(2016)11215

3LI Xiaobin et al. (2017)21115

4WANG Lingxiao et al. (2011)11114

5WANG Ping et al. (2016)11114

6MA Yukun et al. (2011)11114

7WEI Wei et al. (2012)21216

8ZHU Qiuyan et al. (2016)21216

9CHEN Xiao et al. (2016)21115

Notes: The standards for evaluation:
Random allocation: 2: appropriate random allocation was used; 1: random allocation was used but the method was unclear; 0: random allocation was inappropriately used or was not used.
Allocation concealment: 2: appropriate allocation concealment was used; 1: allocation concealment was used but the method was unclear; 0: the allocation concealment was inappropriately used or was not used.
Blinding: 2: appropriate blinding was used; 1: blinding was used but the method was unclear; 0: the blinding was inappropriately used or was not used.
Loss to follow-up: 1: the number and reason of loss to follow-up were described; 0: the number and reason of loss to follow-up were not described.
Jadad score: 1-3: low quality; 4-7: high quality.