Transfers to metropolitan hospitals and coronary angiography for rural Aboriginal and non‐Aboriginal patients with acute ischaemic heart disease in Western Australia

Table 4 Sensitivity analysis using (i) three definitions for Aboriginal identification, and (ii) 28-day vs 90-day events

	IHD		MI
Method of identifying Aboriginal status	RR (95% CI)	p value	RR (95% CI)	p value
(i) Coronary angiography
≥25% of admissions: 28-day event	0.94 (0.86-1.03)	0.186	0.94 (0.86-1.03)	0.195
First admission for event: 28-day event	0.97 (0.88-1.06)	0.473	0.96 (0.88-1.06)	0.431
Any admission: 90-day event	0.94 (0.86-1.02)	0.119	0.96 (0.89-1.04)	0.371
(ii) Transfer to metropolitan hospital
≥25% of admissions: 28-day event	0.96 (0.88-1.04)	0.305	0.98 (0.91-1.05)	0.579
First admission for event: 28-day event	0.97 (0.90-1.06)	0.535	0.99 (0.92-1.07)	0.888
Any admission: 90-day event	1.00 (0.93-1.07)	0.942	1.00 (0.94-1.07)	0.958
(iii) Receipt of coronary angiography if transferred to metropolitan hospital
≥25% of admissions: 28-day event	0.98 (0.93-1.04)	0.569	0.97 (0.91-1.03)	0.275
First admission for event: 28-day event	1.02 (0.94-1.05)	0.900	0.97 (0.91-1.04)	0.423
Any admission: 90-day event	0.95 (0.90-1.03)	0.061	0.97 (0.92-1.03)	0.338

Results are compared to Model 4 from Table 2 which has been adjusted for age groups, sex, residential area, SES, IHD category (for IHD) or MI type (for MI), 5-year history of chronic pulmonary disease, diabetes, HF, kidney disease and private insurance.
RR = Risk ratio; 95% CI = 95% confidence interval; IHD = ischaemic heart disease; MI = myocardial infarction; SES = socio-economic status; HF = heart failure.

ISSN: 1471-2261