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Newcastle–Ottawa quality assessment scale table
| Study | Selection (out of 4) | Comparability (out of 2) | Outcome (out of 3) | Total (out of 9) | Overall rating |
|---|---|---|---|---|---|
| Ang et al1 | 3 | 0 | 2 | 5 | Adequate |
| Defreyne et al2 | 3 | 0 | 2 | 5 | Adequate |
| Eriksson et al3 | 3 | 0 | 2 | 5 | Adequate |
| Jairath et al4 | 3 | 0 | 2 | 5 | Adequate |
| Langner et al5 | 3 | 0 | 1 | 4 | Adequate |
| Larssen et al6 | 3 | 0 | 2 | 5 | Adequate |
| Ripoll et al7 | 3 | 0 | 2 | 5 | Adequate |
| Venclauskas et al8 | 3 | 0 | 2 | 5 | Adequate |
| Wong et al9 | 3 | 0 | 2 | 5 | Adequate |
