Table 2.
The NOS assessment—longitudinal studies.
| Selection | Comparability | Outcomes | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Study | Representativeness of exposed cohort | Selection of non-exposed cohort | Ascertainment of exposure | Demonstration that outcome of interest was not present at start of study | Adjust for the most important risk factors | Adjust for other risk factors | Assessment of outcome | Follow-up length | Loss to follow-up rate | Total quality score |
| Carol127 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |
| De Vos et al.128 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |
| De Vylder et al.129 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 8 |
| Dragt et al.65 | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 5 |
| Freitas et al.130 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |
| Jang et al.131 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |
| Kline et al.38 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 8 |
| Kraan et al.132 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |
| Kraan et al.133 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |
| Masillo et al.134 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 6 |
| Mason et al.135 | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 1 | 5 |
| Stowkowy et al.62 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |
| Trotman et al.21 | 0 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 6 |