Table 5. SNB and AD practice according to age, treatment and tumour characteristics.

	N	SNB %	AD %	P-value
Tumour size (cm) (1)
<10	431	11.1	5.6
10–20	291	18.2	10.3	<0.0001
>20	340	36.3	17.3
Nuclear grade (2)
Low	268	11.2	5.2
Intermediate	490	18.2	10.4	0.0025
High	515	29.7	13.2
Lesion subtype (3)
Comedo	272	31.6a	11.4b	<0.0001a
Other	851	18.1	10.3	0.6b
Treatment
CS	99	7.1	4
CS+RT	797	12.9	5.1	<0.0001
Mastectomy	393	41.7	22.6
Age (years)
<50	370	26.8c	10.3d
50–60	461	20.4	10.2	0.0074c
61–70	285	15.8	11.2	0.5d
>70	173	20.8	9.8

Abbreviations: AD=axillary dissection; CS=conservative surgery; RT=radiotherapy; SNB=sentinel node biopsy.

Missing values: ⁽¹⁾ 227; ⁽²⁾ 16; ⁽³⁾ 166.

^aP-value between lesion subtype (comedo versus other) for SNB.

^bP-value between lesion subtype (comedo versus other) for AD.

^cP-value according to age (<50 vs >50years) for SNB.

^dP-value according to age (<50 vs >50years) for AD.