Table 2. | Newcastle-Ottawa scale for assessing quality of non-randomized studies categorized as low-quality (0 to 3 stars), moderate quality (4 to 6 stars), and high quality (7 to 9 stars) |
| Study |
Year of publication |
Selection (maximum 4 stars) |
Comparability (maximum 2 stars) |
Outcome (maximum 3 stars) |
Total score/quality |
|---|---|---|---|---|---|
| Schwarz et al. [31] | 2019 | ★ ★ ★ ★ | ★ ★ | ★ ★ ★ | 9 stars/high quality |
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