Table 2.
Newcastle-Ottawa quality assessments scale.
| Studies | Selection | Comparability | Outcome | Scores | |||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | ||
| Zhang 2019 (1) | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | 8 | |
| Zhang 2019 (2) | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | 8 | |
| Bi 2020 | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 9 |
| Pan 2020 | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | 8 | |
| Yilmaz 2020 | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 9 |
| Grossmann 2021 | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 9 |
| Katayama 2021 | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 9 |
| Ke 2021 | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 9 |
| Yamashita 2021 | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 9 |
| Zhao 2021 | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 9 |
| Li 2022 | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 9 |
| Wang 2022 | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | 8 | |
1 = representativeness of the exposed cohort, 2 = selection of the non-exposed cohort, 3 = ascertainment of exposure, 4 = outcome of interest not present at start of study, 5 = outcome of interest not present at start of study, 6 = assessment of outcome, 7 = assessment of outcome, 8 = adequacy of follow up of cohorts.
(1) and (2) represent two datasets in the same article.