Table 1.
Interobserver variability for parenchymal patterns.
| Pattern | n* | Agreement** | Kappa (95 % CI) | Kappa class |
|---|---|---|---|---|
| Nodular pattern | ||||
| Perilymphatic nodules | 9.5 | 123/126 (98 %) | 0.83 (0.64–1.02) | Near perfect |
| Tree-in-bud nodules | 15.0 | 122/126 (97 %) | 0.85 (0.70-0.99) | Near perfect |
| Non-tree-in-bud nodules | 6.5 | 119/126 (94 %) | 0.44 (0.04-0.84) | Moderate |
| Ground glass | 28.5 | 101/126 (80 %) | 0.44 (0.24-0.64) | Moderate |
| Reticular pattern | 57.5 | 107/126 (85 %) | 0.70 (0.57-0.82) | Substantial |
| Interlobular septations | 9.5 | 121/126 (96 %) | 0.72 (0.47-0.96) | Substantial |
| Intralobular lines | 19.5 | 101/126 (80 %) | 0.28 (0.03-0.53) | Fair |
| Septations + lines | 43.0 | 104/126 (83 %) | 0.61 (0.46-0.76) | Substantial |
| Crazy paving | 13.5 | 113/126 (90 %) | 0.47 (0.19-0.74) | Moderate |
| Consolidation | 43.0 | 110/126 (87 %) | 0.72 (0.59-0.85) | Substantial |
| Without air bronchogram | 27.5 | 107/126 (85 %) | 0.56 (0.38-0.74) | Moderate |
| With air bronchogram | 19.5 | 119/126 (94 %) | 0.79 (0.64-0.94) | Substantial |
| Decreased attenuation | ||||
| Emphysema | 24.0 | 110/126 (87 %) | 0.61 (0.44-0.79) | Substantial |
| Honey combing | 27.0 | 118/126 (94 %) | 0.81 (0.69-0.94) | Near perfect |
| Other cystic patterns | 6.0 | 124/126 (98 %) | 0.83 (0.59–1.07) | Near perfect |
| Normal | 16.0 | 124/126 (98 %) | 0.93 (0.83–1.03) | Near perfect |
Note: * Average number of cases are the sum of the two observers findings divided by two. ** The number of HRCTs, out of the total 126, in which the two observers agreed on whether a pattern was present or not.