Table 2.
Inter-Reader Concordance for CT.
| Feature | Reader 1 | Reader 2 | Number Concordant (%) + | Kappa |
|---|---|---|---|---|
|
| ||||
| Opacity Presence | 71 | 72 | 87/88 (98.9) | 0.96 |
| Opacity Extent 0—no opacity 1— <25 % 2–25 - <50 % 3–50 - <75 % 4— >75 % |
17 31 8 16 16 |
16 27 18 13 14 |
69/88 (78.4) | 0.86 |
| Opacity Distribution None Peripheral Central and Peripheral Central |
17 16 54 1 |
16 16 55 1 |
85/88 (96.6) | 0.94 |
| Subpleural Lines | 23 | 24 | 87/88 (98.9) | 0.97 |
| Subpleural Reticulation | 45 | 48 | 83/88 (94.3) | 0.89 |
+
Denominator is 88, corresponding to number of lung quadrants scored by each reader, in 22 exams.