Table 2 Newcastle–Ottawa Scale (NOS) risk of bias assessment of the included studies
Author, Year | Selection (0–4) | Comparability (0–2) | Exposure/outcome (0–3) | Total score (0–9) |
|---|---|---|---|---|
Branley-Bell et al. (2020) | 2 | 0 | 3 | 5 |
Machitelli et al. (2020) | 4 | 2 | 3 | 9 |
McCombie et al. (2020) | 2 | 0 | 3 | 5 |
Phillipou et al. (2020) | 4 | 2 | 3 | 9 |
Phillipou et al. (2020) | 4 | 2 | 3 | 9 |
Schlegl et al. (a) (2020) | 2 | 0 | 3 | 5 |
Schlegl et al. (b) (2020) | 2 | 0 | 3 | 5 |
Termorshuizen et al. (2020) | 2 | 0 | 3 | 5 |
Frayn et al. (2021) | 1 | 0 | 3 | 4 |
Jonikas et al. (2021) | 2 | 0 | 3 | 5 |
Robertson et al. (2021) | 3 | 1 | 3 | 7 |
Spettigue et al. (2021) | 3 | 2 | 3 | 8 |
Spigel et al. (2021) | 2 | 0 | 3 | 5 |
Vuillier et al. (2021) | 2 | 2 | 3 | 7 |