Table 2.

Correlation between ultrasound and CNB

		Core biopsy		Total
		M	B, I, S
Ultrasound	M	205	4	209
	B, I, S	675	1169	1844
Total		880	1173	2053
Pearson chi-squared	p-value	Kappa coefficient		p-value
289.732	< 0.0001	0.254		< 0.0001
Sensitivity	0.2330	Positive predictive value		0.9809
Specificity	0.9966	Negative predictive value		0.6339

B: benign, I: indeterminate, S: suspicious, M: malignant