Spatial accessibility to health facilities in Sub-Saharan Africa: comparing existing models with survey-based perceived accessibility
Abstract Background Mapping geographical accessibility to health services is essential to improve access to public health in sub-Saharan Africa. Different methods exist to estimate geographical accessibility, but little is known about the ability of these methods to represent the experienced accessi...
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| Format: | Article |
| Language: | English |
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BMC
2022-11-01
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| Series: | International Journal of Health Geographics |
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| Online Access: | https://doi.org/10.1186/s12942-022-00318-z |
| _version_ | 1817970817167785984 |
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| author | Jérémie Bihin Florence De Longueville Catherine Linard |
| author_facet | Jérémie Bihin Florence De Longueville Catherine Linard |
| author_sort | Jérémie Bihin |
| collection | DOAJ |
| description | Abstract Background Mapping geographical accessibility to health services is essential to improve access to public health in sub-Saharan Africa. Different methods exist to estimate geographical accessibility, but little is known about the ability of these methods to represent the experienced accessibility of the population, and about the added-value of sophisticated and data-demanding methods over simpler ones. Here we compare the most commonly used methods to survey-based perceived accessibility in different geographical settings. Methods Modelled accessibility maps are computed for 12 selected sub-Saharan African countries using four methods: Euclidean distance, cost-distance considering walking and motorized speed, and Kernel density. All methods are based on open and large-scale datasets to allow replication. Correlation coefficients are computed between the four modelled accessibility indexes and the perceived accessibility index extracted from Demographic and Health Surveys (DHS), and compared across different socio-geographical contexts (rural and urban, population with or without access to motorized transports, per country). Results Our analysis suggests that, at medium spatial resolution and using globally-consistent input datasets, the use of sophisticated and data-demanding methods is difficult to justify as their added value over a simple Euclidian distance method is not clear. We also highlight that all modelled accessibilities are better correlated with perceived accessibility in rural than urban contexts and for population who do not have access to motorized transportation. Conclusions This paper should guide researchers in the public health domain for knowing strengths and limits of different methods to evaluate disparities in health services accessibility. We suggest that using cost-distance accessibility maps over Euclidean distance is not always relevant, especially when based on low resolution and/or non-exhaustive geographical datasets, which is often the case in low- and middle-income countries. |
| first_indexed | 2024-04-13T20:38:55Z |
| format | Article |
| id | doaj.art-5199d3c94b6c4b1989283e801a73eb9b |
| institution | Directory Open Access Journal |
| issn | 1476-072X |
| language | English |
| last_indexed | 2024-04-13T20:38:55Z |
| publishDate | 2022-11-01 |
| publisher | BMC |
| record_format | Article |
| series | International Journal of Health Geographics |
| spelling | doaj.art-5199d3c94b6c4b1989283e801a73eb9b2022-12-22T02:30:57ZengBMCInternational Journal of Health Geographics1476-072X2022-11-0121111110.1186/s12942-022-00318-zSpatial accessibility to health facilities in Sub-Saharan Africa: comparing existing models with survey-based perceived accessibilityJérémie Bihin0Florence De Longueville1Catherine Linard2Department of Geography, University of NamurDepartment of Geography, University of NamurDepartment of Geography, University of NamurAbstract Background Mapping geographical accessibility to health services is essential to improve access to public health in sub-Saharan Africa. Different methods exist to estimate geographical accessibility, but little is known about the ability of these methods to represent the experienced accessibility of the population, and about the added-value of sophisticated and data-demanding methods over simpler ones. Here we compare the most commonly used methods to survey-based perceived accessibility in different geographical settings. Methods Modelled accessibility maps are computed for 12 selected sub-Saharan African countries using four methods: Euclidean distance, cost-distance considering walking and motorized speed, and Kernel density. All methods are based on open and large-scale datasets to allow replication. Correlation coefficients are computed between the four modelled accessibility indexes and the perceived accessibility index extracted from Demographic and Health Surveys (DHS), and compared across different socio-geographical contexts (rural and urban, population with or without access to motorized transports, per country). Results Our analysis suggests that, at medium spatial resolution and using globally-consistent input datasets, the use of sophisticated and data-demanding methods is difficult to justify as their added value over a simple Euclidian distance method is not clear. We also highlight that all modelled accessibilities are better correlated with perceived accessibility in rural than urban contexts and for population who do not have access to motorized transportation. Conclusions This paper should guide researchers in the public health domain for knowing strengths and limits of different methods to evaluate disparities in health services accessibility. We suggest that using cost-distance accessibility maps over Euclidean distance is not always relevant, especially when based on low resolution and/or non-exhaustive geographical datasets, which is often the case in low- and middle-income countries.https://doi.org/10.1186/s12942-022-00318-zAccess to healthSpatial modellingPerceived accessibilitySub-Saharan Africa |
| spellingShingle | Jérémie Bihin Florence De Longueville Catherine Linard Spatial accessibility to health facilities in Sub-Saharan Africa: comparing existing models with survey-based perceived accessibility International Journal of Health Geographics Access to health Spatial modelling Perceived accessibility Sub-Saharan Africa |
| title | Spatial accessibility to health facilities in Sub-Saharan Africa: comparing existing models with survey-based perceived accessibility |
| title_full | Spatial accessibility to health facilities in Sub-Saharan Africa: comparing existing models with survey-based perceived accessibility |
| title_fullStr | Spatial accessibility to health facilities in Sub-Saharan Africa: comparing existing models with survey-based perceived accessibility |
| title_full_unstemmed | Spatial accessibility to health facilities in Sub-Saharan Africa: comparing existing models with survey-based perceived accessibility |
| title_short | Spatial accessibility to health facilities in Sub-Saharan Africa: comparing existing models with survey-based perceived accessibility |
| title_sort | spatial accessibility to health facilities in sub saharan africa comparing existing models with survey based perceived accessibility |
| topic | Access to health Spatial modelling Perceived accessibility Sub-Saharan Africa |
| url | https://doi.org/10.1186/s12942-022-00318-z |
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