Table 1B. Newcastle-Ottawa Scale for Assessing Quality of Cohort Studies.
| Quality assessment scale | Accepted criteria | Gupta et al. (2007)2 | Korelitz et al. (2014)3 |
|---|---|---|---|
| Selection | |||
| Representativeness of the exposed cohort | Representative of average UC Sex, age and disease severity |
- | - |
| Representativeness of the non-exposed cohort | Drawn from the same community as exposed cohort | * | * |
| Ascertainment of exposure | Secure records | * | - |
| Demonstration that outcome of interest was not present at start of study | No neoplasia (or history of neoplasia) on first colonoscopy | * | - |
| Comparability | |||
| Comparability of cohorts on the basis | Match between design and confounders of cases-controls | - | - |
| Outcome | |||
| Follow-up long enough for outcome to occur? | Assessment of outcome | - | * |
| Adequacy of follow up of cohorts | Follow-up of complete cohort or unlikely to introduce bias? | * | * |
| Total | (max=8) | 4 | 3 |
*Method accepted; - Method not accepted.