Impact of Traffic Congestion on Spatial Access to Healthcare Services in Nairobi: an ecological study
Abstract Background Geographic accessibility is an important determinant of healthcare utilisation and is critical for achievement of universal health coverage. Despite the high disease burden and severe traffic congestion in many African cities, few studies have assessed how traffic congestion impacts geographical access to healthcare facilities and to health professionals in these settings. Methods Using data on health facilities obtained from the Ministry of Health in Kenya, we mapped 944 primary, 94 secondary and four tertiary healthcare facilities in Nairobi County. We then used traffic probe data to identify areas within a 15-, 30- and 45-minute drive from each health facility during peak and off-peak hours and calculated the proportion of the population with access to healthcare in the County. We employed a 2-step floating catchment area model to calculate the ratio of healthcare and healthcare professionals to population during these times. Results During peak hours, <70% of Nairobi’s 4.1 million population was within a 30-minute drive from a health facility. This increased to >75% during off-peak hours. In 45 minutes, the majority of the population had an accessibility index of one health facility accessible to more than 100 people (<0.01) for primary health care facilities while secondary and tertiary health facilities had a ratio of one health facility for more than 10,000 people (<0.0001) and at least two health facilities per 100,000 people (>0.00002) respectively. Of people with access to health facilities, a sub-optimal ratio of <2.3 healthcare professionals per 1000 people was observed in facilities offering primary and secondary healthcare during peak and off-peak hours. Conclusion These findings can guide urban planners and policymakers in improving access to healthcare facilities to optimise coverage during peak and off-peak traffic times. Similarly, growing availability of traffic probe data in African cities should enable similar analysis in other countries.