title: External validation of the Cardiff model of information sharing to reduce community violence: natural experiment.
abstract: BACKGROUND
  Community violence is a substantial problem for the NHS. Information sharing of emergency department data with community safety partnerships (CSP) has been associated with substantial reductions in assault attendances in emergency departments supported by academic institutions. We sought to validate these findings in a setting not supported by a public health or academic structure.
  
  
  METHODS
  We instituted anonymous data sharing with the police to reduce community violence, and increased involvement with the local CSP. We measured the effectiveness of this approach with routinely collected data at the emergency department and the police. We used police data from 2009, and emergency department data from 2000.
  
  
  RESULTS
  Initially, the number of assault patients requiring emergency department treatment rose after we initiated data sharing. After improving the data flows, the number of assault patients fell back to the predata-sharing level. There was no change in the number of hospital admissions during the study period. There were decreases in the numbers of violent crimes against the person, with and without injury, recorded by the police.
  
  
  CONCLUSIONS
  We have successfully implemented data sharing in our institution without the support of an academic institution. This has been associated with reductions in violent crime, but it is not clear whether this association is causal.
authors.affiliation: Emergency Department, Addenbrooke's Hospital Cambridge University Hospitals NHS Foundation Trust, , Cambridge, Cambridgeshire, UK.
authors.forename: Adrian A
authors.initials: AA
authors.lastname: Boyle
authors.forename: Katrina
authors.initials: K
authors.lastname: Snelling
authors.forename: Laura
authors.initials: L
authors.lastname: White
authors.forename: Barak
authors.initials: B
authors.lastname: Ariel
authors.forename: Lawrence
authors.initials: L
authors.lastname: Ashelford
mesh_terms: D000328:Adult; D003299:Cooperative Behavior; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D004739:England; D005260:Female; D006801:Humans; D007255:Information Services / Q000592:standards*; D008297:Male; D016495:Police; D014754:Violence / Q000517:prevention & control* / Q000706:statistics & numerical data; D014947:Wounds and Injuries / Q000209:etiology / Q000517:prevention & control*