Table 7.

Inter-observer Reliability of Evaluation of Tumor Ossification

Observer	Total (n =40)	≥ 90% Necrosis (n=15)	≤ 50% Necrosis (n=10)
A
Increase in ossification	29	14	4
No increase	11	1	6
B
Increase in ossification	31	15	5
No increase	9	0	5

Inter-observer reliability measured by Cohen’s Kappa, with k=0.73 indicating 90% agreement.