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| First author (year) | Selection | Comparability | Outcome | Total score | |||||
|---|---|---|---|---|---|---|---|---|---|
| No. (1) | No. (2) | No. (3) | No. (4) | No. (1) | No. (1) | No. (2) | No. (3) | ||
| Gann et al. (1975) | * | * | ** | * | * | 6 | |||
| Melgarejo-Moreno et al. (1997) | * | * | ** | * | * | * | 7 | ||
| Vivas et al. (2010) | * | * | ** | * | * | * | 7 | ||
| Melgarejo-Moreno et al. (2015) | * | * | ** | * | * | * | 7 | ||
| Iwasaki et al. (2009) | * | * | ** | * | * | 6 | |||
Note:
Newcastle–Ottawa quality assessment of included studies.
