Modified Oxford 5-Point Quality Scale for assessment of methodological quality of the three included studies
| Criteria | Alimi et al28 | Chen et al29 | Dang and Yang30 |
|---|---|---|---|
| Study described as randomised (+1) | 1 | 1 | 1 |
| Appropriate randomisation method (+1) | 1 | 1 | 1 |
| Inappropriate method of randomisation (–1) | – | – | – |
| Subject blinded (+1) | 0 | 0 | 0 |
| Evaluator blinded (+1) | 1 | 0 | 0 |
| Dropouts/withdrawals described | 1 | 0 | 0 |
| Score | 4 | 2 | 2 |