Table 3.

Features of 'basal' versus 'non-basal' tumours

Parameter	Basal	Non-basal	Adjusted odds ratio	p value
Oestrogen receptor
Positive	8 (9%)	183 (52%)		<0.0001
Negative	72 (81%)	150 (42%)	10.9 (5.08–23.2)
Progesterone receptor
Positive	4 (5%)	122 (33%)		<0.0001
Negative	75 (85%)	206 (58%)	11.9 (4.2–33.6)
Axillary nodes
Positive	37 (42%)	214 (60%)		0.0023
Negative	49 (55%)	135 (38%)	0.44 (0.27–0.72)
Tumour size
p1	5 (6%)	22 (6%)	1.0	0.92
p2	66 (75%)	247 (70%)	1.41 (0.50–3.97)
p3	17 (19%)	76 (21%)	1.19 (0.38–3.7)
Menopausal status
Premenopausal	42 (47%)	133 (37%)	1.0
Perimenopausal	15 (17%)	49 (14%)	1.91 (0.71–5.19)
Postmenopausal	33 (38%)	164 (46%)	1.31 (3.80)
Mean age in years	49.9 (SE 1.30)	53.9 (SE 0.65)		0.0065

Tumour sizes: p1, <2 cm; p2, 2–5 cm; p3, >5 cm. SE, standard error.