First author (year) | Selection | Comparability | Outcomes | ||||||
---|---|---|---|---|---|---|---|---|---|
Representativeness of the exposed cohort | Selection of the nonexposed cohort | Ascertainment of exposure | Demonstration that the outcome of interest was not present at the start of the study | Controlled for age and comorbidities | Controlled for any additional factors | Assessment of outcomes | Sufficient follow-up | Adequacy of follow-up | |
Lv et al. 2016 [8] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ |
Bohl et al. 2018 [7] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ |
Chang et al. 2018 [10] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | |
Wang et al. 2019 [12] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ |
Salarbaks et al. 2020 [9] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | |
Shin et al. 2020 [11] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | |
Wang et al. 2020 [19] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | |
Xiang et al. 2020 [13] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | |
Zhao et al. 2020 [14] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | |
Ji et al. 2021 [18] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ |