Table 4.
Newcastle-Ottawa Scale for nonrandomized cohort studies
| Study | Selection | Comparability | Outcome | Quality 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 on the Basis of the Design or Analysis | Assessment of Outcome | Was Follow-Up Long Enough for Outcomes to Occur | Adequacy of Follow Up of Cohorts | ||
| Araujo, 2008 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 7 |
| Plumhans, 2011 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 6 |
| Aribaş, 2012 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 6 |
| Vetter, 2013 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Liu, 2014 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 7 |
| Nagasawa, 2014 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 7 |
| Ozbudak, 2014 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Wu, 2014 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Jung, 2015 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |