TABLE 3.
Agreement amongst all pathologists on tumour subtype, grade and combined diagnoses considering cases achieving a consensus diagnosis
| Number of cases | Fleiss' kappa statistic (95% confidence interval) | Percentage agreement | |
|---|---|---|---|
| Combined overall a | 71 | 0.466 (0.422–0.509) | 66% |
| Subtype overall | 71 | 0.542 (0.477–0.606) | 80% |
| Grade overall b | 67 | 0.516 (0.440–0.591) | 82% |
| Oligodendroglioma | 52 | 0.585 (0.511–0.659) | |
| Astrocytoma | 18 | 0.566 (0.492–0.640) | |
| Undefined glioma | 1 | 0.280 (0.206–0.354) | |
| Low‐grade glioma b | 14 | 0.516 (0.440–0.592) | |
| High‐grade glioma b | 53 | 0.516 (0.440–0.592) | |
| Low‐grade oligodendroglioma | 8 | 0.380 (0.219–0.548) | |
| High‐grade oligodendroglioma b | 42 | 0.545 (0.471–0.619) | |
| Low‐grade astrocytoma | 6 | 0.554 (0.480–0.628) | |
| High‐grade astrocytoma | 10 | 0.430 (0.356–0.504) | |
| High‐grade undefined glioma | 1 | 0.361 c |
a
Consensus diagnosis on both glioma subtype and grade.
b
Cases with any pathologist response of ‘other’ (non‐glioma) were excluded from kappa analysis and percentage agreement calculation for grade.
c
Low sample size precludes calculation of confidence interval.