title: Validity of self reported crashes and injuries in a longitudinal study of young adults.
abstract: OBJECTIVE
  The aim of this study was to determine the validity of self report as a source of information on crashes and injuries.
  
  
  METHODS
  This study was part of the Dunedin Multidisciplinary Health and Development Study (DMHDS), which is a longitudinal study of the health, development, and behaviour of a cohort of young New Zealanders.
  
  
  METHODS
  At the age 21 assessment DMHDS study members were asked to report serious injury and motor vehicle traffic crashes experienced over the previous three years. The self reported injuries were compared with the New Zealand Health Information Service (NZHIS) public hospital discharge file to determine the completeness of the self reported data. The traffic crashes were compared with the police traffic crash reports to determine the accuracy of self reported crash details.
  
  
  RESULTS
  Twenty five (86%) of the 29 unintentional injuries, six (67%) of the nine assaults, and one (14%) of the six self inflicted injuries on the NZHIS file were self reported. The level of agreement between the self reported crash details and those recorded on the traffic crash report was high.
  
  
  CONCLUSIONS
  The results show that self reports can be a useful and valid source of injury and crash data.
authors.affiliation: Injury Prevention Research Unit, University of Otago Medical School, Dunedin, New Zealand. dbegg@gandalf.otago.ac.nz
authors.forename: D J
authors.initials: DJ
authors.lastname: Begg
authors.forename: J D
authors.initials: JD
authors.lastname: Langley
authors.forename: S M
authors.initials: SM
authors.lastname: Williams
mesh_terms: D000063:Accidents, Traffic / Q000706:statistics & numerical data*; D000328:Adult; D005260:Female; D006760:Hospitalization / Q000706:statistics & numerical data; D006801:Humans; D015994:Incidence; D008137:Longitudinal Studies; D008297:Male; D009520:New Zealand / Q000453:epidemiology; D010358:Patient Participation; D015203:Reproducibility of Results; D012307:Risk Factors; D014947:Wounds and Injuries / Q000145:classification / Q000453:epidemiology*