Methodology quality of the included RCTs
| Study | Jadad score | ||||
| Randomisation | Allocation concealment | Blinding | Attrition | Score | |
| Min and Yanlin 200717 | 1 | 0 | 1 | 0 | 2 |
| Huaping 201518 | 1 | 0 | 0 | 0 | 1 |
| Lei et al 201019 | 1 | 0 | 1 | 0 | 2 |
| Newman et al 199820 | 1 | 0 | 0 | 0 | 1 |
| Woodcock et al 198721 | 1 | 0 | 0 | 0 | 1 |
| Guçlu et al 201422 | 1 | 0 | 1 | 0 | 1 |
| Kanbak et al 200427 | 1 | 2 | 1 | 0 | 4 |
| Baki et al 201328 | 1 | 2 | 1 | 0 | 4 |
| Singh et al 201126 | 2 | 2 | 1 | 0 | 5 |
| Tingting et al 200723 | 1 | 0 | 0 | 0 | 1 |
| Jianrong et al 200924 | 1 | 0 | 0 | 0 | 1 |
| Shudong 201525 | 1 | 0 | 0 | 0 | 1 |
| Jiying et al 201029 | 2 | 0 | 1 | 0 | 3 |
RCTs, randomised controlled trials.