Table 1A. Newcastle-Ottawa Scale for Assessing Quality of Case-Control Studies.
| Quality assessment scale | Accepted criteria | Rutter et al. (2004)1 | Rubin et al. (2013)4 |
|---|---|---|---|
| Selection | |||
| 1. Is the case definition adequate? | Independent validation; Record linkage | - | - |
| 2. Representativeness of the cases | Representative of average UC Sex, age and disease severity |
- | * |
| 3. Selection of controls | Population from similar setting | * | * |
| 4. Definition of controls | No history of neoplasia | * | * |
| Comparability | |||
| Comparability of cases and controls on basis of the design and follow-up | Cases and controls were adequately matched | * | * |
| Exposure | |||
| Ascertainment of exposure | Secure histology records | - | - |
| Same method of ascertainment for cases and controls | Same histological scores between cases-controls | * | * |
| Total | (max=8) | 4 | 5 |
*Method accepted; - Method not accepted.