LAUSR

OBJECTIVES Although several studies have examined the gap in healthcare use between indigenous and non-indigenous people, empirical evidence on inequity in healthcare use within indigenous populations is limited. This study aims to fill this gap in the literature by investigating income-related inequity (unequal use for equal need) in healthcare use among indigenous Australians living in non-remote areas. STUDY DESIGN This is a cross-sectional study. METHODS This study used data from the Australian Aboriginal and Torres Strait Islander Health Survey, 2012-13. Logistic regression analysis was used to determine the association of income with the probability of a general practitioner (GP) visit, a specialist visit and inpatient admission. The horizontal inequity (HI) index and decomposition analysis were also used to quantify and explain inequity in healthcare use. RESULTS No consistent association was found between income and the probability of GP visit or inpatient admission after controlling for health need. However, the likelihood of visiting a specialist was about three times (odds ratio = 2.96, P = 0.028) higher for the richest compared with the poorest population subgroups. The inequity index was 0.016 (P < 0.001), indicating a pro-rich inequity for the probability of visiting a specialist. Income inequality, unequal distribution of private health insurance and inequality in education were the main factors explaining the pro-rich inequity in specialist utilisation. CONCLUSIONS Although there was no income-related inequity in GP visits or inpatient admissions, wealthier indigenous Australians had a higher probability of visiting a specialist than their poorer counterparts, after adjusting for need. Specific policies and initiatives are required to address the inequity faced by low-income indigenous people in Australia.