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Newcastle-Ottawa scale summary of observational studies.
| Study | Selection | Comparability | Outcome | Overall |
|---|---|---|---|---|
| Ko et al. | ★★★★ | ★★ | 6 | |
| Gorter et al. | ★★★ | ★ | 4 | |
| Ingstad et al. | ★★ | ★★ | ★ | 5 |
| Bodendorfer et al. | ★★★★ | ★ | 5 | |
| Sprague et al. | ★★ | ★★ | ★ | 5 |
Overall score: poor < 4; fair 5-6; good > 7.
