Table 2 Newcastle-Ottawa Scale for Risk of Bias Assessment of Cohort Studies Included in the Meta-Analysis
Study | Selection | Comparability | Outcome | Overall | |||||
|---|---|---|---|---|---|---|---|---|---|
Representativeness of Exposed Cohort | Selection of Nonexposed | Ascertainment of Exposure | Outcome Not Present at Start | Assessment of Outcome | Adequate Follow- Up Length | Adequacy of Follow-Up | |||
Michele Abate et al. 2015 [17] | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 9 |
Yanqing Guo et.al 2016 [19] | ★ | ★ | ★ | ★ | ★★ | ★★ | ★ | ☆ | 9 |