Diagnostic performance and inter-observer concordance in lesion detection with the automated breast volume scanner (ABVS)

Table 4 Distribution of cases by rater, reported and true categories

	Examiner 1		Examiner 1
	ABVS negative		ABVS positive
	Examiner 2	Examiner 2	Examiner 2	Examiner 2	Total
	ABVS negative	ABVS positive	ABVS negative	ABVS positive	Total
Benign cases (conventional ultrasound negative)	34^a	22	8	18^a	82
Malignant cases (conventional ultrasound positive)	0^a	3	0	15^a	18
Total	34	25	8	33	100

The inter-rater validity coefficient calculates to κ = 0.31 (95% CI: 0.21-0.41). The conditional inter-rater validity coefficient is κ=0.18 (95% CI: 0.00-0.26) for the benign cases and κ=0.80 (95% CI: 0.61-1.00) for the malignant cases.
^aconcordance between examiner 1 and examiner 2.

ISSN: 1471-2342