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Methods to measure potential spatial access to delivery care in low- and middle-income countries: a case study in rural Ghana

Nesbitt, Robin C. ; Gabrysch, Sabine ; Laub, Alexandra ; Soremekun, Seyi ; Manu, Alexander ; Kirkwood, Betty R. ; Amenga-Etego, Seeba ; Wiru, Kenneth ; Höfle, Bernhard ; Grundy, Chris

In: International journal of health geographics, 13 (2014), Nr. 25. pp. 1-13. ISSN 1476-072X

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Download (1MB) | Lizenz: Creative Commons LizenzvertragMethods to measure potential spatial access to delivery care in low- and middle-income countries: a case study in rural Ghana by Nesbitt, Robin C. ; Gabrysch, Sabine ; Laub, Alexandra ; Soremekun, Seyi ; Manu, Alexander ; Kirkwood, Betty R. ; Amenga-Etego, Seeba ; Wiru, Kenneth ; Höfle, Bernhard ; Grundy, Chris underlies the terms of Creative Commons Attribution 3.0 Germany

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Abstract

Background: Access to skilled attendance at childbirth is crucial to reduce maternal and newborn mortality. Several different measures of geographic access are used concurrently in public health research, with the assumption that sophisticated methods are generally better. Most of the evidence for this assumption comes from methodological comparisons in high-income countries. We compare different measures of travel impedance in a case study in Ghana’s Brong Ahafo region to determine if straight-line distance can be an adequate proxy for access to delivery care in certain low- and middle-income country (LMIC) settings. Methods: We created a geospatial database, mapping population location in both compounds and village centroids, service locations for all health facilities offering delivery care, land-cover and a detailed road network. Six different measures were used to calculate travel impedance to health facilities (straight-line distance, network distance, network travel time and raster travel time, the latter two both mechanized and non-mechanized). The measures were compared using Spearman rank correlation coefficients, absolute differences, and the percentage of the same facilities identified as closest. We used logistic regression with robust standard errors to model the association of the different measures with health facility use for delivery in 9,306 births. Results Non-mechanized measures were highly correlated with each other, and identified the same facilities as closest for approximately 80% of villages. Measures calculated from compounds identified the same closest facility as measures from village centroids for over 85% of births. For 90% of births, the aggregation error from using village centroids instead of compound locations was less than 35 minutes and less than 1.12 km. All non-mechanized measures showed an inverse association with facility use of similar magnitude, an approximately 67% reduction in odds of facility delivery per standard deviation increase in each measure (OR = 0.33). Conclusion: Different data models and population locations produced comparable results in our case study, thus demonstrating that straight-line distance can be reasonably used as a proxy for potential spatial access in certain LMIC settings. The cost of obtaining individually geocoded population location and sophisticated measures of travel impedance should be weighed against the gain in accuracy.

Item Type: Article
Journal or Publication Title: International journal of health geographics
Volume: 13
Number: 25
Publisher: BioMed Central
Place of Publication: London
Date Deposited: 22 May 2015 12:51
Date: 2014
ISSN: 1476-072X
Page Range: pp. 1-13
Faculties / Institutes: Fakultät für Chemie und Geowissenschaften > Institute of Geography
Medizinische Fakultät Heidelberg > Institut für Public Health (IPH)
Subjects: 610 Medical sciences Medicine
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