Table 2 Intra-observer agreement using protocol A (contrast enhanced) 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 | 72.6 (62.1–83.1) | 0.71 (0.57–0.80) Substantial | < 0.001 | 73.9 (63.7–84.3) | 0.80 (0.70–0.90) Substantial | < 0.001 | 89.0 (81.7–96.4) | 0.87 (0.79–0.96) Almost perfect | < 0.001 |
Tumour Calcifications | 68.5 (57.6–79.4) | 0.58 (0.42–0.74) Moderate | < 0.001 | 78.1 (60.4–87.8) | 0.73 (0.60–0.86) Substantial | < 0.001 | 90.4 (83.5–97.3) | 0.88 (0.79–0.97) Almost perfect | < 0.001 |
Lymphadenopathy | 90.4 (83.4–97.3) | 0.82 (0.69–0.95) Almost perfect | < 0.001 | 68.5 (57.6–79.4) | 0.37 (0.15–0.59) Fair | < 0.001 | 89.0 (81.7–96.4) | 0.81 (0.68–0.94) Almost perfect | < 0.001 |
Diagnosis | 73.2 (62.3–84.2) | 0.68 (0.55–0.81) Substantial | < 0.001 | 64.4 (53.1–75.6) | 0.57 (0.44–0.71) Moderate | < 0.001 | 91.8 (85.3–98.2) | 0.90 (0.85–0.98) Almost perfect | < 0.001 |