Table 2. Correlation between presentation with bone metastases and primary tumour characteristics.

		Bone metastases at presentation with metastatic disease
Tumour characteristics		Yes	No	Univariate analysis
Histological grade (%)	1	14 (70)	6 (30)	χ2=7.90
	2	71 (68)	34 (32)	P=0.0193
	3	94 (52)	87 (48)
ER status (%)	+VE	157 (69)	71 (31)	χ2=19.755
	−VE	60 (45)	73 (55)	P<0.0001
Lymph node stage (%)	1	29 (48)	31 (52)	χ2=6.13
	2	70 (68)	33 (32)	P=0.0467
	3	40 (60)	27 (40)
Primary tumour size (mm) (%)	<15	23 (55)	19 (45)	χ2=4.389
	15–30	56 (37)	96 (63)	P=0.1114
	>30	35 (40)	52 (60)
Patient age (%)	⩽40	15 (56)	12 (44)	χ2=2.889
	41–50	46 (64)	26 (36)	P=0.5766
	51–60	56 (56)	44 (44)
	61–70	59 (60)	40 (40)
	>70	91 (65)	48 (35)
Tumour type (%)	Ductal NST	114 (56)	89 (44)	Ductal NST vs tubular mixed χ2=5.03 P=0.025
	Tubular mixed	24 (77)	7 (23)
	Lobular	25 (69)	11 (31)
	Mixed ductal and lobular	10 (50)	10 (50)	Ductal NST vs lobular χ2=2.22 P=0.136
	Pure tubular	2 (67)	1 (33)