Table 3.
The methodological quality of cohort studies in accordance with the Newcastle-Ottawa Scale (NOS)
| Selection |
Comparability | Outcome |
Total score | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Study | 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? | |
| Curb33 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 1 | 6 |
| Choi37 | 0 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 8 |
| Choi38 | 0 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 8 |