Cancer treatment and the risk of cancer death among Aboriginal and non-Aboriginal South Australians: analysis of a matched cohort study

Table 4 Competing risk regression analyses for cancer survival among Aboriginal and matched non- Indigenous cohorts by discrete treatment type, Models 1 to 4

	Model 1 - baseline^a			Model 2 - surgery among cohorts			Model 3 - systemic therapy among cohorts			Model 4 - radiotherapy among cohorts
	Subhazard Risk Ratio	95% CI	p > \|z\|	Subhazard Risk Ratio	95% CI	p > \|z\|	Subhazard Risk Ratio	95% CI	p > \|z\|	Subhazard Risk Ratio	95% CI	p > \|z\|
Aboriginal x geographic remoteness non- Indigenous
not Remote	0.67	0.56–0.80	<0.001	0.70	0.59–0.83	<0.001	0.68	0.57–0.81	<0.001	0.68	0.57–0.80	<0.001
Remote	0.87	0.40–1.87	0.71	0.90	0.39–2.07	0.81	0.92	0.42–1.98	0.82	0.90	0.41–2.01	0.80
Aboriginal
not Remote	1.00	Reference		1.00	Reference		1.00	Reference		1.00	Reference
Remote	1.65	1.13–2.41	<0.01	1.70	1.16–2.49	<0.01	1.62	1.12–2.35	0.011	1.76	1.22–2.54	<0.01
Comorbidity score (Elixhauser)
0–3	1.00	Reference		1.00	Reference		1.00	Reference		1.00	Reference
4+	1.58	1.08–2.31	0.02	1.65	1.13–2.42	0.01	1.49	1.01–2.21	0.05	1.53	1.04–2.24	0.03
Stage at diagnosis
Local	1.00	Reference
Regional	2.57	1.86–3.56	<0.001
Distant	6.20	4.30–8.93	<0.001
Unknown	4.61	2.66–8.00	<0.001
Stage x treatment modality
Local stage with/without treatment modality				0.34	0.25–0.47	<0.001	0.35	0.25–0.48	<0.001	0.26	0.19–0.36	<0.001
Not local stage with treatment modality				1.00	Reference		1.00	Reference		1.00	Reference
Not local stage without treatment modality				2.05	1.48–2.85	<0.001	1.65	1.24–2.19	<0.01	1.07	0.79–1.43	0.667
BIC	641.4			635.9			641.0			648.0

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