Table 4. Survival of women treated by specialist and nonspecialist surgeons by tumour size, nodal status, age, socioeconomic status.

	5-year survival (%)
Factor	Specialists	Nonspecialists	RHR*	95% CI
Tumour size (cm)
<2	89.9	81.6	0.78	(0.64–0.91)
2–3.9	76.6	68.5	0.79	(0.69–0.92)
4+	49.6	51.1	0.99	(0.83–1.19)
				Test for interaction, P=0.004
Nodal status
Negative	88.7	84.1	0.82	(0.70–0.95)
1–3 nodes positive	73.9	63.3	0.75	(0.65–0.88)
4+ nodes positive	57.3	40.0	0.81	(0.69–0.88)
				Test for interaction, P=0.38
Age group (years)
<50	75.7	69.5	0.79	(0.68–0.93)
50–64	78.4	65.7	0.83	(0.74–0.93)
64–74	73.6	66.8	0.89	(0.77–1.02)
				Test for interaction, P=0.38
Socioeconomic status
Affluent	79.3	70.6	0.88	(0.74–1.04)
Intermediate	77.3	68.0	0.83	(0.74–0.94)
Deprived	73.8	63.5	0.82	(0.72–0.93)
				Test for interaction, P=0.70

Adjusted for tumour size, nodal status, age, method of detection and socioeconomic status; 95% CI=95% confidence interval.