Study | Selection | Comparability | Outcome | Total score | ||||||
---|---|---|---|---|---|---|---|---|---|---|
Representativ-eness of the exposed cohort | Selection of the non -exposed cohort | Ascertainment of exposure | Demonstration that outcome of interest was not present at start of study | Comparability of cohorts on the basis of the design or analysis | Assessment of outcome | Was follow-up long enough | Adequacy of follow up of cohorts | |||
Sakin et al. [10] | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 9 | |
Pan et al. [11] | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 8 | ||
Suzuki et al. [18] | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 9 | |
Suzuki et al. [19] | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | 8 | ||
Wen et al. [21] | ★ | ★ | ★ | ★★ | ★ | ★ | 7 | |||
Käsmann et al. [16] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 | |
Cao et al. [15] | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 9 | |
Shao et al. [17] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 7 | ||
Xie et al. [12] | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 9 | |
Kang et al. [9] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 | |
Wang et al. [20] | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 8 |