*Notes: Variables tested in the adjusted models: (1) Total population, (2) Vehicle density, (3) Road density, (4) Allowance of imported used vehicles allowed. SOAT and the Zero Tolerance Plan were not
Correlation coefficient and p value for nationwide, region, and prefecture with significant inverse correlation between number of COVID-19 infections and number of incidents, injuries, and fatalities
Demographic characteristics of cases (i.e., drivers admitted to emergency unit at hospital) and controls (i.e., drivers interviewed during road checks carried out by the police).