Table 4.
Inter-rater agreement in differentiation of posterior cranial fossa neoplasms.
| Diagnosis | Cohen's Kappa | ||
|---|---|---|---|
| Clinical report vs Reader #1 | Clinical report vs Reader #2 | Reader #1 vs Reader #2 | |
| Metastasis | 0.802 | 0.839 | 0.787 |
| Hemangioblastoma | 0.788 | 0.820 | 0.728 |
| Pilocytic astrocytoma | 0.749 | 0.662 | 0.679 |
| Ependymoma | 0.664 | 0.781 | 0.677 |
| Medulloblastoma | 0.724 | 0.615 | 0.823 |
| Low grade glioma/astrocytoma | 0.718 | 0.569 | 0.423 |
| Lymphoma | 0.388 | −0.006 | −0.006 |
| Anaplastic astrocytoma | 0.435 | −0.006 | −0.006 |
| Atypical teratoid/rhabdoid tumor | 0.057 | −0.012 | 0.593 |
| Glioblastoma multiforme | 0.559 | 0.535 | 0.291 |
| Subependymoma | 0.000 | 0.000 | 0.063 |
| Choroid plexus papilloma | −0.008 | −0.005 | −0.005 |
| Ganglioglioma | 0.000 | 0.000 | 0.000 |
| Rosette-forming glioneuronal tumor | 0.000 | 0.000 | 0.000 |
The Cohen's Kappa co-efficient for inter-rater agreement in classification of each neoplasm type among the official clinical report, and two independent neuroradiologist reviewers.