| Criterion | |||||||
|---|---|---|---|---|---|---|---|
| Study (year) | 1 | 2 | 3 | 4 | 5 | Total | Overall quality |
| Prueter et al (2019) 18 | 1 | 1 | 1 | 1 | 1 | 5 | High |
| Graffeo et al (2018) 12 | 0 | 1 | 1 | 1 | 1 | 4 | Moderate |
| Panigrahi et al (2018) 17 | 1 | 1 | 0 | 1 | 1 | 4 | Moderate |
| Iannella et al (2017) 2 | 1 | 1 | 0 | 1 | 1 | 4 | Moderate |
| Hwang et al (2002) 13 | 1 | 1 | 1 | 0 | 1 | 4 | Moderate |
| Yokoyama et al (1996) 20 | 1 | 1 | 0 | 0 | 1 | 4 | Moderate |
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