Table 4.

Summary statistics for extramural vascular invasion (EMVI) assessment with MRI for both observers

Histopathology	MRI
	Observer 1 (number of patients)			Observer 2 (number of patients)
	EMVI negative	EMVI positive	Total	EMVI negative	EMVI positive	Total
EMVI negative	28	7	35	32	3	35
EMVI positive	7	12	19	14	5	19
Total	35	19	54	46	8	54

Observer 1: kappa 0.43 (0.18–0.68), accuracy 74% (61–84%), sensitivity 63% (41–81%), specificity 80% (64–90%), positive-predictive value (PPV) 63% (41–81%) and negative-predictive value (NPV) 80% (64–90%).

Observer 2: kappa 0.2 (−0.04 to 0.45), accuracy 69% (55–79%), sensitivity 26% (12–49%), specificity 91% (78–97%), PPV 62% (31–86%) and NPV 70% (55–81%).