Table 4.
Kappa values calculated for all specimens, and separately for biopsies and resection specimens
| Diagnoses | Percentage agreement (pₐ) | Percentage chance agreement (pₑ) | κ (coefficient) (95% CI) |
|---|---|---|---|
| All diagnoses | |||
| Combined | 0.8855 | 0.6466 | 0.6762 (0.6416–0.7108) |
| Biopsy | 0.7945 | 0.492 | 0.5955 (0.5381–0.6530) |
| Resection | 0.9224 | 0.7147 | 0.7281 (0.6615–0.7946) |
| Thymoma split 1 | |||
| Combined | 0.7877 | 0.5275 | 0.5506 (0.5134–0.5879) |
| Biopsy | 0.682 | 0.4919 | 0.374 (0.2933–0.4547) |
| Resection | 0.824 | 0.5413 | 0.6163 (0.5754–0.6573) |
| Thymoma split 2 | |||
| Combined | 0.7877 | 0.6951 | 0.4929 (0.4352–0.5506) |
| Biopsy | 0.7749 | 0.6578 | 0.3423 (0.2348–0.4497) |
| Resection | 0.8695 | 0.7092 | 0.5512 (0.4940–0.6083) |
CI, confidence interval.
Kappa values were calculated for thymoma subgroups, with thymomas divided into two categories with different therapeutic consequences. Split 1 refers to (A, AB, B1) versus (B2, B3), and split 2 refers to (A, AB, B1, B2) versus (B3).