Table 1 Scores of 6 cohort studies using Newcastle-Ottawa Criteria
Study | Selection | Comparability | Outcomes | Total | |||||
|---|---|---|---|---|---|---|---|---|---|
| Â | Representativeness of the exposed cohort | Selection of the non-exposed cohort | Ascertainment of exposure | Demonstration that outcome of interest was not present at the start of the 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 the follow-up of cohorts | Â |
Fujita, S. 2003 [2] | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 7 |
Kusters, M. 2009 [6] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 1 | 8 |
Watanabe, T. 2002 [22] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Oki, Eiji 2019 [12] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Ozawa, H. 2016 [10] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 1 | 8 |
Ogura 2019 [16] | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 7 |