Table 3.
The Newcastle-Ottawa Scale (NOS) for assessing the quality of cohort studies.
| First author | Year | Selection | Comparability | Outcome | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Representative of the exposed cohort | Selection of the nonexposed cohort | Ascertainment of exposed | Demonstration that outcome of interest was no present at start of study | Control for important cohort | Additional factors | Assessment of outcome | Follow-up | Adequacy of follow-up | Score | ||
| Cooper | 1998 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 6 |
| Jacobsen | 1999 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 5 |
| Cooper | 2000 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 6 |
| Kleijn | 2002 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Jacobsen | 2003 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 8 |
| Mondul | 2005 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 8 |
| Amagai | 2006 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 6 |
| Cui | 2006 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 6 |
| Hong | 2007 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 7 |
| Tom | 2012 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Li | 2013 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 6 |
| Wu | 2014 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 7 |
| Lay | 2018 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 8 |
| Malek | 2019 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 6 |
| Zhang | 2019 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 8 |
| Shen | 2020 | 1 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 6 |