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External validation of the Cardiff model of information sharing to reduce community violence: natural experiment
  1. Adrian A Boyle1,
  2. Katrina Snelling1,
  3. Laura White2,
  4. Barak Ariel3,
  5. Lawrence Ashelford1
  1. 1Emergency Department, Addenbrooke's Hospital Cambridge University Hospitals NHS Foundation Trust, Cambridge, Cambridgeshire, UK
  2. 2Clinical School, Cambridge University, Cambridge, UK
  3. 3Institute of Criminology, Cambridge University, Cambridge, UK
  1. Correspondence to Dr Adrian A Boyle, Emergency Department, Addenbrooke's Hospital Cambridge University Hospitals NHS Foundation Trust, Box 87, Cambridge, Cambridgeshire CB2 2QQ, UK; Adrian.boyle{at}


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.

  • violence
  • violence, interpersonal

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