Table 3 Risk of assessment bias using Newcastle–Ottawa Scale
Author | Selection | Comparability | Outcome | Score | |||||
|---|---|---|---|---|---|---|---|---|---|
Representativeness 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 | Assessment of Outcome | Follow-up Long Enough for Outcome to Occur | Adequacy of Follow-Up | ||
Pyun et al. (2017) [12] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Choi et al. (2011) [13] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Cho et al. (2016) [14] | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Woo et al. (2017) [12] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Jaeger et al. (2014) [13] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |