Intra-investigator variation results
| Descriptor | Response (%) | κ | |||||
| 1 | 2 | 3 | 4 | 5 | Standard | Weighted | |
| Vascular pattern | 3.3 | 5.0 | 23.3 | 11.7 | 56.7 | 0.51 | 0.61 |
| Mucosal erythema | 5.0 | 15.8 | 39.2 | 15.8 | 24.2 | 0.37 | 0.43 |
| Mucosal surface | 11.7 | 12.5 | 35.0 | 8.3 | 32.5 | 0.37 | 0.45 |
| Mucosal oedema | 7.8 | 11.2 | 34.5 | 10.3 | 36.2 | 0.33 | 0.43 |
| Mucopus | 30.0 | 17.5 | 33.3 | 8.3 | 10.3 | 0.38 | 0.47 |
| Bleeding | 33.3 | 38.3 | 15.0 | 10.0 | 3.3 | 0.51 | 0.57 |
| Incidental friability | 24.4 | 38.3 | 14.8 | 15.7 | 7.0 | 0.37 | 0.49 |
| Contact friability (CFT) | 23.5 | 10.8 | 30.4 | 8.8 | 26.5 | 0.33 | 0.34 |
| Erosions and ulcers | 26.7 | 32.5 | 31.7 | 9.2 | – | 0.56 | 0.65 |
| Extent of erosions and ulcers | 26.7 | 32.8 | 25.9 | 14.7 | – | 0.51 | 0.60 |
Based on 60 repeat pair assessments (two pairs per investigator) of 36 separate videos with Mayo Clinic scores between 1 and 11. ‘Response’ for each descriptor refers to the percentage of responses across all assessments. ‘Descriptor’ refers to the descriptive term used for endoscopic assessment (table 1). Columns 1–5 represent levels on the Likert scale of severity for each item. Erosions and ulcers and extent of erosion and ulcers items had four response levels on the Likert scale; all other items had five levels.
CFT, Contact Friability Test.