Table 1. Healthcare utilisation rates with adjustment of fiscal year and either chronological age or estimated life expectancy.

Subspecialty	Population Group (chronological age or life expectancy correction)	Incidence Rate Ratio (95% CI)	p-value
Cardiology	Non-Aboriginal	1
	Welfare	2.31 (2.14 to 2.48)	<0.0001
	Aboriginal (chronological age)	0.97 (0.89 to 1.04)	0.362
	Aboriginal (life expectancy)	0.66 (0.62 to 0.71)	<0.0001
Ophthalmology	Non-Aboriginal	1
	Welfare	1.81 (1.71 to 1.92)	<0.0001
	Aboriginal (chronological age)	0.82 (0.76 to 0.89)	<0.0001
	Aboriginal (life expectancy)	0.85 (0.79 to 0.90)	<0.0001

Cessation of payments at age 65 precludes estimation of life expectancy for the welfare group.