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Decomposing the association between the amount of exposure and the frequency of self-reported involvement in a road crash
  1. Eladio Jiménez-Mejías1,2,
  2. Pablo Lardelli-Claret1,2,
  3. José Juan Jiménez-Moleón1,2,
  4. Carmen Amezcua-Prieto1,2,
  5. José Pulido Manzanero2,3,
  6. Juan de Dios Luna-del-Castillo2,4
  1. 1Department of Preventive Medicine and Public Health, School of Medicine, University of Granada, Granada, Spain
  2. 2Centros de Investigación Biomédica en Red de Epidemiología y Salud Pública (CIBERESP), Spain
  3. 3Centro Nacional de Epidemiología, Instituto de Salud Carlos III, Madrid, Spain
  4. 4Department of Biostatistics, School of Medicine, University of Granada, Granada, Spain
  1. Correspondence to Dr Eladio Jiménez Mejías, Departamento de Medicina Preventiva y Salud Pública, Facultad de Medicina Universidad de Granada, Avda. de Madrid 11, Granada 18012, Spain; eladiojimenez{at}ugr.es

Abstract

We tried to obtain preliminary evidence to test the hypothesis that the association between driving exposure and the frequency of reporting a road crash can be decomposed into two paths: direct and indirect (mediated by risky driving patterns). In a cross-sectional study carried out between 2007 and 2010, a sample of 1114 car drivers who were students at the University of Granada completed a questionnaire with items about driving exposure during the previous year, risk-related driving circumstances and involvement in road crashes. We applied the decomposition procedure proposed by Buis for logit models. The indirect path showed a strong dose-response relationship with the frequency of reporting a road crash, whereas the direct path did not. The decomposition procedure was able to identify the indirect path as the main explanatory mechanism for the association between exposure and the frequency of reporting a road crash.

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