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| Study type | Number of study | Evaluation | Scores | Included studies | Percentage |
| RCT | 7 | Jadad Scale | 1 | 4 | 57% |
| 2 | 2 | 29% | |||
| 3 | 1 | 14% | |||
| nRCT | 12 | Newcastle-Ottawa Scale | 7 | 2 | 17% |
| 8 | 4 | 33% | |||
| 9 | 6 | 50% |
Abbreviations: RCT: randomized controlled trials; nRCT: non-randomized controlled trials.
