Table 2 The Newcastle–Ottawa scale (NOS) scoring
Study (year) | Selection | Comparability | Outcome | Total | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Representativeness of the exposed cohort | Selection of the nonexposed cohort | Ascertainment of exposure | Outcome not present at baseline | Control for age | Control for other confounding factors | Assessment of outcome | Enough long follow-up duration | Adequacy of follow-up of cohorts | ||
RingaitienÄ— et al. (2015) | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 8 |
Chu et al. (2016) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Mazzola et al. (2017) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Velayati et al. (2019) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
van der Wulp et al. (2021) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Sánchez Acedo et al. (2020) | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 7 |
Zhao et al. (2020) | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 8 |