Table 4.

Odds ratios for the final variables retained in the predictive algorithm

Parameter	Odds ratio	95% CI	p-value
Age Group
0–17 years	1.00	-
18–39 years	0.94	0.74–1.19	0.60
40–64 years	1.09	0.88–1.36	0.43
65–74 years	1.32	1.06–1.65	0.02
75+ years	1.30	1.05–1.61	0.02
SEIFA1
Most disadvantaged	1.00	-
Quintile 2	0.85	0.78–0.94	0.001
Quintile 3	0.96	0.86–1.06	0.39
Quintile 4	0.79	0.71–0.89	0.0001
Least Disadvantaged	0.80	0.68–0.94	0.007
ARIA2
Major city	1.00	-
Inner Regional	1.01	0.92–1.11	0.81
Outer Regional	1.10	1.00–1.22	0.04
Remote	1.30	1.04–1.62	0.02
Very Remote	1.36	1.08–1.73	0.01
Co-morbidities
Anaemia	1.31	1.16–1.47	0.001
Acute coronary syndrome	1.14	1.04–1.25	0.005
Heart failure	1.25	1.12–1.38	<0.0001
Peripheral vascular disease	1.32	1.10–1.58	0.003
Malignant neoplasms	1.29	1.10–1.51	0.002
COPD	1.21	1.10–1.34	0.0002
Mental disorder (alcohol)	1.42	1.16–1.74	0.001
Diabetes	1.27	1.16–1.39	<0.0001
Chronic renal failure	1.30	1.12–1.52	0.001
Mood disorders	1.22	1.00–1.50	0.06
Liver diseases	1.45	1.06–1.99	0.02
Any previous admission
Past year
None	1.00	-
One	1.14	1.01–1.28	0.03
Two or more	1.63	1.38–1.91	<0.0001
Past 3 years
None	1.00	-
One	1.45	1.31–1.62	<0.0001
Two or more	1.74	1.53–1.98	<0.0001

¹Socio-Economic Indexes for Areas

²Accessibility/Remoteness Index of Australia