Mortality after admission for acute myocardial infarction in Aboriginal and non-Aboriginal people in New South Wales, Australia: a multilevel data linkage study

Table 4 Adjusted odds ratios for selected hospital covariates for 30-day and 365-day mortality multilevel models

	30-day mortality			365-day mortality
	AOR	95% CI	p-value	AOR	95% CI	p-value
Added into adjusted ^a model separately
Remoteness of hospital^b
Major city (ref)	1.00		<.001	1.00		<.001
Inner regional	1.15	0.94-1.41		1.16	0.97-1.39
Outer regional	1.56	1.26-1.94		1.54	1.27-1.87
Remote/very remote	1.83	1.19-2.81		1.79	1.22-2.61
Average acute admissions per year
Less than 1200	2.03	1.57-2.62	<.001	1.98	1.58-2.49	<.001
1200-3899	1.72	1.39-2.13		1.55	1.28-1.88
3900-7084	1.36	1.08-1.70		1.32	1.07-1.62
7085-18399	1.14	0.96-1.35		1.14	0.97-1.34
18400 or more (ref)	1.00			1.00
On-site angiography
Yes	0.74	0.64-0.86	<.001	0.72	0.63-0.83	<.001
No (ref)	1.00			1.00

AOR, adjusted odds ratios; CI, confidence interval. Ref, referent group in the analysis.
^a Adjusted for Aboriginal status, age, sex, year of admission, comorbidities, remoteness of residence, socio-economic status, and a random hospital intercept, with hospital covariates added in one at a time to the model.
^b Accessibility/Remoteness Index of Australia (ARIA+) based on hospital postcode.

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