Table 1.

Summary statistics of assessment of poor prognosis (T3c or greater) of disease with MRI for both observers

Histopathology	MRI
	Observer 1 (number of patients)			Observer 2 (number of patients)
	T3b or less	T3c or greater	Total	T3b or less	T3c or greater	Total
T3b or less	27	7	34	32	2	34
T3c or greater	7	14	21	12	9	21
Total	34	21	55	44	11	55

T3b or less—T1, T2 or T3 with 5-mm or less extramural invasion (good prognosis).

T3c or greater—T3 with >5-mm extramural invasion or T4 (poor prognosis).

Observer 1: kappa 0.46 (0.22–0.7), accuracy 75% (62–84%), sensitivity 67% (45–83%), specificity 79% (63–90%), positive-predictive value (PPV) 67% (45–83%) and negative-predictive value (NPV) 79% (63–90%).

Observer 2: kappa 0.41 (0.17–0.64), accuracy 75% (62–84%), sensitivity 43% (24–63%), specificity 94% (81–98%), PPV 82% (52–95%) and NPV 73% (58–84%).