Table 4.

False-negative rate of axillary ultrasound (AUS) depending on extension of nodal involvement (n = 166)

	nodal-positive	AUS positive	AUS negative		p
	n	n	n	%
Nodal metastasis size *					<0.001
≤5 mm	41	4	37	90.2
5.1-10 mm	46	19	27	58.7
>10 mm	76	55	21	27.6
Number of metastatic involved lymph nodes					<0.001
N1 (1–3)	86	27	59	68.6
N2 (4–9)	48	28	20	41.7
N3 (≥10)	32	24	8	25.0
Capsular infiltration					<0.001
No	83	23	60	72.3
Yes	83	56	27	32.5

* 3 missing value.