Table 3 Intra-observer agreement using protocol B (unenhanced) and protocol C (both)
Characteristic | Observer A agreement (95% CI) | Gwet’s AC1 (95% CI) | P value | Observer B agreement | Gwet’s AC1 (95% CI) | P value | Observer C agreement | Gwet’s AC1 (95% CI) | P value |
|---|---|---|---|---|---|---|---|---|---|
Primary tumour location | 76.7 (66.8–86.6) | 0.73 (0.62–0.85) Substantial | < 0.001 | 71.2 (60.6–81.9) | 0.67 (0.56–0.80) Substantial | < 0.001 | 73.6 (62.9–84.2) | 0.71 (0.59–0.82) Substantial | < 0.001 |
Tumour calcifications | 80.8 (71.6–90.1) | 0.75 (0.63–0.88) Substantial | < 0.001 | 76.7 (66.8–86.6) | 0.71 (0.57–0.84) Substantial | < 0.001 | 71.2 (60.6–81.9) | 0.61 (0.46–0.76) Substantial | < 0.001 |
Lymphadenopathy | 82.2 (73.3–91.2) | 0.65 Substantial | < 0.001 | 75.3 (65.2–85.5) | 0.51 Moderate | < 0.001 | 84.9 (76.5–93.3) | 0.72 Substantial | < 0.001 |
Diagnosis | 66.7 (55.4–77.9) | 0.60 (0.47–0.74) Moderate | < 0.001 | 63.4 (51.6–75.1) | 0.58 (0.44–0.71) Moderate | < 0.001 | 100 | 1 Almost perfect | < 0.001 |