Table 2.

Relative odds of 30-day and 365-day mortality for Aboriginal compared with non-Aboriginal people with stepwise adjustment for covariates

30-day mortality models
Model	Adjusted for:	OR	95% CI	p-value
1A	Hospital of admissiona	0.61	0.48-0.78	<.001
	Individual covariates
2A	+ Age group, sex, year of admission	1.07	0.83-1.37	.612
3A	+ Comorbid conditionsb	0.98	0.76-1.27	.886
4A	+ Remoteness of residencec	0.95	0.73-1.24	.728
5A	+ Socio-economic statusd	0.95	0.73-1.23	.684
	Hospital covariatese
6A	+ Remoteness of hospitalc	0.94	0.72-1.22	.617
7A	+ Average acute admissions per year (- Remoteness of hospital)	0.95	0.73-1.23	.676
8A	+ On-site angiography (- Average acute admissions per year)	0.94	0.73-1.23	.665
365-day mortality models
Model	Adjusted for:	OR	95% CI	p-value
1B	Hospital of admissiona	0.64	0.53-0.77	<.001
	Individual covariates
2B	+ Age group, sex, year of admission	1.34	1.10-1.63	.003
3B	+ Comorbid conditionsb	1.12	0.91-1.38	.282
4B	+ Remoteness of residencec	1.11	0.90-1.37	.317
5B	+ Socio-economic statusd	1.11	0.90-1.36	.345
	Hospital covariatese
6B	+ Remoteness of hospitalc	1.09	0.89-1.35	.401
7B	+ Average acute admissions per year (- Remoteness of hospital)	1.11	0.90-1.36	.336
8B	+ On-site angiography (- Average acute admissions per year)	1.10	0.90-1.36	.350

OR, odds ratio; CI, confidence interval.

^a Hospital of admission adjusted for in a two-level random intercept model with patients nested within hospitals.

^b Comorbid conditions with one-year look-back, including comorbidities on current admission and any admissions in the previous year.

^c Accessibility/Remoteness Index of Australia (ARIA+) based on statistical local area of residence for individuals or hospital postcode for hospitals.

^d Socio-Economic Indices for Areas (SEIFA) Index of Relative Socio-Economic Disadvantage population quintiles based on statistical local area of residence.

^e Hospital covariates added one at a time to the adjusted models.