Table 2 The Newcastle–Ottawa assessment form for cohort studies for quality appraisal
Study | Representativeness of exposed cohort | Selection of non-exposed cohort | Ascertainment of exposure | Outcome not present at start | Comparability of cohorts | Assessment of outcome | Length of follow-up | Adequacy of follow-up | Quality |
|---|---|---|---|---|---|---|---|---|---|
Shah | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | Good |
Perisanidis | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | Good |
Abu-Ghanem* | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | Good |
Danan | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | Good |
Ngyugen | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 1 | Poor |
Rogers | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | Poor |
Sato | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | Poor |