Role of public transport in accessibility to emergency dental care in Melbourne, Australia.

The aim of this study was to develop a method for the analysis of the influence of public transport supply in a large city (Melbourne) on the access to emergency dental treatment. Geographic Information Systems (GIS) tools were used to associate the geographical distribution of patients (and their socioeconomic status) with accessibility (through public transport supply, i.e. bus, tram and/or train) to emergency dental care. The methodology used allowed analysis of the socioeconomic status of patient residential areas and both spatial location and supply frequency of public transport by using existing data from patient records, census and transport departments. In metropolitan Melbourne, a total of 13 784 patients met the inclusion criteria for the study sample, of which 95% (n = 13 077) were living within a 50 km radius of the Royal Dental Hospital of Melbourne. Low socioeconomic areas had a higher demand for dental emergency care in the Royal Dental Hospital of Melbourne. Public transport supply was similar across the various socioeconomic strata in the population, with 80% of patients having good access to public transport. However, when considering only high-frequency bus stops, the percentage of patients living within 400 m from a bus stop dropped to 65%. Despite this, the number of patients (adjusted to the population) coming from areas not supplied by public transport, and from areas with good or poor public transport supply, was similar. The methodology applied in the present study highlights the importance of evaluating not only the spatial distribution but also the frequency of public transport supply when studying access to services. This methodology can be extrapolated to other settings to identity transport/access patterns for a variety of services.