Table 5.
Interreader agreement amongst three readers in Lung-RADS classification, by nodule margin
| Nodule margin | α | 95% CI | Observed agreement | Size category | Observed matrix | |||
|---|---|---|---|---|---|---|---|---|
| Category | 2 | 3 | 4A | 4B | ||||
| Smooth | 0.67 | 0.51, 0.81 | 56 (75%) | 2 | 20 | 6.5 | 0.5 | 0 |
| 3 | 6.5 | 28.0 | 2.5 | 0 | ||||
| 4A | 0.5 | 2.5 | 8 | 0 | ||||
| 4B | 0 | 0 | 0 | 0 | ||||
| Lobulated | 0.71 | 0.59, 0.81 | 55 (73%) | 2 | 4 | 7 | 0 | 0 |
| 3 | 7 | 33 | 3 | 0 | ||||
| 4A | 0 | 3 | 18 | 0 | ||||
| 4B | 0 | 0 | 0 | 0 | ||||
| Spiculated | 0.50 | 0.32, 0.67 | 46 (61%) | 2 | 1 | 4.5 | 0.5 | 0 |
| 3 | 4.5 | 13 | 9.5 | 0 | ||||
| 4A | 0.5 | 9.5 | 32 | 0 | ||||
| 4B | 0 | 0 | 0 | 0 | ||||
| Irregular | 0.72 | 0.62, 0.82 | 46 (61%) | 2 | 3 | 5.5 | 0.5 | 0 |
| 3 | 5.5 | 8 | 5.5 | 0 | ||||
| 4A | 0.5 | 5.5 | 30 | 3 | ||||
| 4B | 0 | 0 | 3 | 5 | ||||
Lung-RADS, Lung CT Screening Reporting and Data System.
95% CI, 95% confidence interval of α Category 2, < 6 mm; Category 3, ≥ 6–< 8 mm; Category 4A, ≥ 8–< 16 mm; Category 4B, ≥ 15 mm; α, Krippendorff’s α coefficient.