Objective: The aim of this study was to evaluate the relationship between ambulance distance to hospitals and mortality from acute diseases using the national database in Japan.
Design: Geospatial ecological study.
Setting: We collected the data of transport distance to hospitals from the Diagnosis Procedure Combination database and that of mortality per 100 000 from some acute diseases from the database of life tables by the Ministry of Health, Labour and Welfare in Japan.
Participants: A total of 108 314 patients (40 882 patients with acute myocardial infarction, 31 632 patients with brain infarction, 4992 patients with subarachnoid hemorrhage, and 30 808 patients with pneumonia) were referred in Japan in 2008.
Main Outcome Measures: We evaluated the association between the mean transport distance to hospitals and the mortality from acute diseases using simple linear regression analysis. This correlation was evaluated separately for each acute disease.
Results: The mean transport distances to hospitals were 8.1 km for acute myocardial infarction, 8.3 km for brain infarction, 9.5 km for subarachnoid hemorrhage, and 7.6 km for pneumonia, whereas the mortalities per 100 000 were 34.6 for acute myocardial infarction, 60.4 for brain infarction, 11.2 for subarachnoid hemorrhage, and 91.6 for pneumonia. Simple linear regression analysis revealed significant positive correlations between transport distance and mortality per 100 000 for acute myocardial infarction and brain infarction (R2 = 0.315 and 0.398, P < .001, respectively). Otherwise, moderate positive correlations between transport distance and mortality per 100 000 were shown for subarachnoid hemorrhage and pneumonia (R2 = 0.112, P < .012 and .233, P < .001, respectively).
Conclusions: This study suggests that the ambulance distance to hospitals significantly influences the risk of mortality for some acute diseases in Japan. Further studies are needed to confirm this association.
This study aims at evaluating the relationship between ambulance distance to hospitals and mortality from acute diseases using the national database in Japan.
Department of Preventive Medicine and Community Health, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Fukuoka, Japan.
Correspondence: Atsuhiko Murata, MD, PhD, Department of Preventive Medicine and Community Health, School of Medicine, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu 807-8555, Japan (firstname.lastname@example.org).
This study was funded by Grants-in-Aid for Research on Policy Planning and Evaluation from the Ministry of Health, Labour and Welfare, Japan.
All authors contributed to the conception and design of the study. SM collected the data and AM drafted the article. AM and SM revised it critically for important intellectual content and approved the final version submitted for publication. AM is the guarantor.
All authors have no conflicts of interest to declare.