Rural-urban variation in the utilisation of publicly funded healthcare services: an age-stratified population-level observational study.

AIM:To compare age-stratified public health service utilisation in Aotearoa New Zealand across the rural-urban spectrum. METHODS:Routinely collected hospitalisation, allied health, emergency department and specialist outpatient data (2014-2018), along with Census denominators, were used to calculate utilisation rates for residents in the two urban and three rural categories in the Geographic Classification for Health. RESULTS:Relative to their urban peers, rural Māori and rural non-Māori had lower all-cause, cardiovascular, mental health and ambulatory sensitive (ASH) hospitalisation rates. The age-standardised ASH rate ratios (major cities as the reference, 95% CIs) across the three rural categories were for Māori 0.79 (0.78, 0.80), 0.83 (0.82, 0.85) and 0.80 (0.77, 0.83), and for non-Māori 0.87 (0.86, 0.88), 0.80 (0.78, 0.81) and 0.50 (0.47, 0.53). Residents of the most remote communities had the lowest rates of specialist outpatient and emergency department attendance, an effect that was accentuated for Māori. Allied health service utilisation by those in rural areas was higher than that seen in the major cities. CONCLUSIONS:The large rural-urban variation in health service utilisation demonstrated here is previously unrecognised and in contrast to comparable international data. New Zealand's most remote communities have the lowest rates of health service utilisation despite high amenable mortality rates. This raises questions about geographic equity in health service design and delivery and warrants further in-depth research.