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Using drivetime analysis to assess the availability of choice in maternity services

This study uses drive-time analysis to evaluate the accessibility of different types of maternity services based on travel distance and time. The darker shading indicates longer travel times to access choice. Using publicly available data, the study calculates distances from small geographic units (LSOAs) to maternity services. The analysis reveals the changes in availability of maternity services between 2007 and 2013.

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Using drivetime analysis to assess the availability of choice in maternity services

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  1. Using drivetime analysis to assess the availability of choice in maternity services Andrew Oliver, National Audit Office

  2. Spatial analysis – maternity services drivetimes • Calculated distance and time people had to travel to closest maternity service by type • Darker the shading, further travel time to access choice • Small geographic units - LSOA • Uses publicly available data • Required additional products to core GIS software • Calculated distance from LSOA to maternity service to provide full data set for report

  3. Calculating maternity services drivetimes – data sources Data from the Department List of maternity service locations and service type as at 2007 and 2013 Plotted postcode locations using GIS Data sourced from the ONS website • Downloaded files at LSOA level showing for both years • Geography shapefiles • Population by gender and age Combined files to show females aged 16-44 for each of approx. 32.5k areas Plotted LSOA population weighted centroids

  4. Calculating maternity services drivetimes – software Uses standard GIS software – MapInfo Professional Supplemented with drivetime add-in and road network

  5. Calculating maternity services drivetimes – processing • Drivetime software uses digital road network to plot route • Nominal scale of 1:50,000 • Route time and distance calculated using pre-defined fixed speeds • Some adjustment for road type and conditions • Sufficient precision for indicative analysis • Load from and to sites • Repeat to account for different maternity service types • Repeat for both 2007 and 2013 • To provide a full data set for report, calculated metrics from LSOA to maternity service rather than creating buffers from maternity service

  6. Maternity services drivetime results 2013 • Darker the shading, further travel time to access choice, in 2013: • 79% of females aged 16-44 have both an obstetrics unit and a midwife led unit within a 30 minute drive • 3% of females aged 16-44 have neither maternity service type within a 30 minute drive 2007 • Access to choice has improved since 2007, with additional midwife led units opened

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