Table 2 Study quality evaluation via the Newcastle-Ottawa Scale
Study | Representativeness of the exposed cohort | Selection of the non-exposed 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 | Total |
|---|---|---|---|---|---|---|---|---|---|---|
Ding 2014 | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 6 |
Zhao 2015 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 7 |
Li 2015 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Wang 2016 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 8 |
Xie 2019 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 9 |
Lv 2019 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 6 |
Zhang 2020 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Yu 2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Xie 2021 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Chaudhuri 2021 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Lazzeri 2021 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Guo 2022 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Zheng 2023 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |