thèse doctorat de l'université bordeaux 2 - ISPED-Enseignement à ...

AnalysisProportions of site- and driver-related characteristics were computed. Discordance (D) ofappreciation for a matched high- and low-risk site was defined as “minor” when difference ofhazard perception level was one on the Likert scale and “major” when level difference wasmore than one. Positive sign (D + ) was used to show that hazard perception was higher for thehigh-risk site than its matched low-risk site, and negative sign (D - ) to show that hazardperception was lower for the high-risk site than its matched low-risk site. Wilcoxon test wasused to assess whether these discordances were significantly higher or lower for high-risk sitethan low-risk site. Similarly, differences in reported speeds for matched high- and low-risksite pairs were compared using a paired t test. Correlations between reported speeds for highandlow-risk site pairs were assessed by intra-class correlation coefficient (ICC). Associationsof driver-, site-, and traffic-factors with road hazard perception level 1 were assessed usinglogistic regression with a backward selection strategy including significant (P