Table 1 Inter-observer agreement when using protocol A (contrast enhanced CT only studies), protocol B (unenhanced CT scans) protocol C (both the unenhanced and contrast enhanced CT scans)
Characteristic | Agreement using protocol A | Gwet’s AC1 (95% CI) | P value | Agreement using protocol B | Gwet’s AC1 (95% CI) | P value | Agreement using protocol C | Gwet’s AC1 (95% CI) | P value |
|---|---|---|---|---|---|---|---|---|---|
Primary tumour location | 74.0 (65.9–82.1) | 0.71 (0.62–0.80) Substantial | < 0.001 | 79.0 (70.8–87.3) | 0.74 (0.67–0.85) Substantial | < 0.001 | 85.8 (79.3–92.4) | 0.84 (0.76–0.92) Almost perfect | < 0.001 |
Tumour calcifications | 77.2 (69.7–84.6) | 0.7 (0.59–0.81) Substantial | < 0.001 | 87.7 (81.4–93.9) | 0.83 (0.75–0.91) Almost perfect | < 0.001 | 86.8 (80.3–93.2) | 0.84 (0.75–0.92) Almost perfect | < 0.001 |
Lymphadenopathy | 71.7 (64.0–79.4) | 0.47 (0.31–0.62) Moderate | < 0.001 | 84.5 (77.9–91.1) | 0.69 (0.56–0.82) Substantial | < 0.001 | 89.0 (83.2–94.9) | 0.79 (0.68–0.90) Substantial | < 0.001 |
Diagnosis | 67.6 (58.7–76.5) | 0.61 (0.51–0.72) Substantial | < 0.001 | 73.5 (64.6–82.4) | 0.68 (0.58–0.79) Substantial | < 0.001 | 73.5 (64.6–82.4) | 0.68 (0.56–0.79) Substantial | < 0.001 |