Disparities in breast screening, stage at diagnosis, cancer treatment and the subsequent risk of cancer death: a retrospective, matched cohort of aboriginal and non-aboriginal women with breast cancer

Table 6 Competing risk regression analysis for cancer survival among Aboriginal and matched non-Aboriginal cohorts, South Australia 1990–2010

	Model 4 - treated				Model 5 - treated (with mastectomy)
	Subhazard Risk Ratio	95% CIs	z	p > \|z\|	Subhazard Risk Ratio	95% CIs	z	p > \|z\|
Aboriginal
No
Yes
Stage at diagnosis
Local	1.00	Reference			1.00	Reference
Regional	34.23	6.76–173.40	4.27	0.000	48.81	3.63–655.42	2.93	0.003
Distant or Unknown	49.67	6.79–363.51	3.85	0.000	69.21	4.21–1138.25	2.97	0.003
Listed with BSSA
No
Yes
Screened by BSSA
No	1.00	Reference			1.00	Reference
Yes	0.07	0.01–0.83	−2.11	0.035	0.05	0.01–0.40	−2.78	0.005
Systemic therapy
No	1.00	Reference			1.00	Reference
Yes	0.06	0.01–0.41	−2.88	0.004	0.05	0.01–0.21	−4.11	0.000
Surgical treatment
No	1.00	Reference
Yes	0.17	0.04–0.74	−2.36	0.018
Mastectomy
No mastectomy					1.00	Reference
Partial					0.10	0.01–0.88	−2.08	0.038
Simple/ subcutaneous					0.23	0.06–0.86	−2.19	0.029
AIC	28.9				28.9

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