BackgroundThe effects of seat belt laws and public education campaigns on seat belt use are assessed on the basis of observational or self-reported data on seat belt use.Previous studies focusing on front seat occupants have shown that self-reports indicate a greater seat belt usage than observational findings.Whether this over-reporting in self reports applies to rear seat belt usage, and to what extent, have yet to be investigated.We aimed to evaluate the over-reporting factor for rear seat passengers and whether this varies by gender and under different compulsory seat belt use conditions.
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