Table 6.
Newcastle-Ottawa Scale (NOS) Risk of Bias Scoring of Included Studies.
| Study | NOS selection | NOS comparable | NOS outcomes | NOS total | Risk of bias |
|---|---|---|---|---|---|
| Ahmadian et al, 201310 | 3 | 1 | 3 | 7 | Medium |
| Attenello et al, 201816 | 2 | 1 | 3 | 6 | Medium |
| Campbell et al, 20185 | 3 | 1 | 2 | 6 | Medium |
| Castellvi et al, 201411 | 3 | 2 | 3 | 8 | Low |
| Fujibayashi et al, 201526 | 3 | 2 | 2 | 7 | Medium |
| Lee et al, 201617 | 2 | 1 | 3 | 6 | Medium |
| Lim et al, 201914 | 3 | 1 | 2 | 6 | Medium |
| Lin et al, 20183 | 3 | 1 | 3 | 7 | Medium |
| Louie et al, 201828 | 3 | 1 | 3 | 7 | Medium |
| Malham et al, 201613 | 3 | 2 | 3 | 8 | Low |
| Marchi et al, 201327 | 3 | 2 | 3 | 8 | Low |
| Nemani et al, 20144 | 3 | 1 | 3 | 7 | Medium |
| Pereira et al, 201725 | 3 | 1 | 3 | 7 | Medium |
| Sato et al, 20171 | 3 | 1 | 3 | 7 | Medium |
| Scherman et al, 20192 | 3 | 1 | 3 | 7 | Medium |
| Average | 2.9 | 1.3 | 2.8 | 6.9 | Medium |