Table 1.
NOS Scale
| Study | Selection | Comparability | Outcome | Total | Quality | |||
|---|---|---|---|---|---|---|---|---|
| Item 1 | Item 2 | Item 3 | Item 4 | Item 5 | Item 6 | |||
| Bussone et al. (2020) | * | * | * | 3 | Medium | |||
| Charles et al. (2021) | * | * | 2 | Low | ||||
| Copeland et al. (2021) | * | * | 2 | Low | ||||
| Dun et al. (2021) | * | * | * | * | * | 5 | High | |
| Elmer et al. (2020) | * | * | 2 | Low | ||||
| Fruehworth et al. (2021) | * | * | 2 | Low | ||||
| Hamza et al. (2021) | * | * | 2 | Low | ||||
| Horita et al. (2021) | * | * | 2 | Low | ||||
| Huckins et al. (2020) | * | * | * | 3 | Medium | |||
| Li et al. (2020a) | * | * | * | 3 | Medium | |||
| Li et al. (2020b) | * | * | * | * | 4 | High | ||
| Meda et al. (2021) | * | * | 2 | Low | ||||
| Rettew et al. (2021) | * | * | 2 | Low | ||||
| Saraswathi et al. (2020) | * | * | * | * | 4 | High | ||
| Van Zyl et al. (2021) | * | * | 2 | Low | ||||
| Wilson et al. (2021) | * | * | 2 | Low | ||||
| Zhang et al. (2020) | * | * | * | * | 4 | High | ||
The NOS includes 6 items: representativeness (item 1); sample size (item 2); comparability (item 3); assessment of the outcomes (item 4); appropriateness of statistical analysis (item 5); drop-out rate assessment (item 6)