News Release

Study reveals impact of lockdown on violence in a UK capital city

Emergency department data shows 'large reduction' in violent injury during lockdown -- but no change in violence in the home

Peer-Reviewed Publication

Cardiff University

The first UK COVID-19 lockdown saw a "rapid and sustained" fall in violence outside the home in the Welsh capital city, a new study led by Cardiff University has shown.

Researchers from Cardiff University's Crime and Security Research Institute (CSRI) and the US Centers for Disease Control and Prevention studied data from Cardiff's sole emergency department (ED) from March to June 2020 and compared it to weekly data from January 2019 onwards.

They found there were almost 60% fewer attendances per week for violent injury outside the home in the first lockdown during which time going outside was allowed only for limited reasons like medical need, exercise or food shopping. The researchers also found a significant reduction in the use of weapons and in violence-related ED visits by males of all ages. Contrary to expectation, the analysis found no significant increase in visits resulting from violence inside the home. The findings - the first analysis of violence from this perspective during the COVID-19 pandemic - are published today in the Journal of the American Medical Association.

Lead author Professor Jonathan Shepherd, from the CSRI, said: "This sudden fall in violent injury is the largest any of us has ever seen. It's likely to reflect closure of city centre pubs and clubs in and around which most violence takes place, and widespread compliance with lockdown restrictions."

The researchers investigated the association between COVID-19 lockdown and ED visits for violence-related injuries using detailed violence screening first implemented in Cardiff two decades ago. They studied violence time, whether it took place inside or outside the home, weapon use, perpetrator type and the age and sex of the injured.

They examined visits at Cardiff's only emergency department - at the University Hospital of Wales - for violence-related injury from 1 January 2019 to 9 June 2020. The pre-lockdown period studied was 63 weeks and the lockdown period, 12 weeks.

They used a "difference-in-difference" regression model to identify statistically significant changes during lockdown. This model accounted for seasonal changes in the number of attendances.

For violence outside the home, they found significant decreases in ED visits during the lockdown of 92% among females under the age of 18 and 65% in males of all ages, and a significant decrease (92%) in those injured with a weapon. While people injured by strangers decreased significantly (65%), numbers of those injured by family members did not change significantly.

Regarding violence in the home, no significant change was found in any category.

"The lack of evidence of increase in violence in the home during the first UK lockdown is reassuring," said Professor Shepherd.

"The massive decrease outside the home but no increase in the home reflects the nature of the two environments. The night-time economy (pubs and clubs and the streets where they are situated) is an environment which facilitates violence and violent injury.

"On the other hand, in our study, the home environment is much less conducive to violence and violent injury. People who would have been injured in violence in the night-time economy are not injured in violence when they stay at home."

The researchers found that during these first months of the COVID-19 epidemic ED visits for all reasons dropped by 43% relative to the previous year. They said that while fears about catching COVID-19 may have affected the number of violence related ED visits, it is unlikely this affected the overall findings.

Cardiff University is due to release an England and Wales analysis of violence during the COVID-19 pandemic next month.


  • The study, Association between COVID-19 lockdown measures and emergency department visits for violence-related injuries in Cardiff, Wales, March-June 2020, is attached as a PDF and can be found here after the embargo
  • A graph of the key findings can be found here
  • Professor Jonathan Shepherd is available for interview For further information and interview requests contact:
  • Gerry Holt, comms & marketing, Cardiff University - 029 2087 5596 or

Cardiff University is recognised in independent government assessments as one of Britain's leading teaching and research universities and is a member of the Russell Group of the UK's most research intensive universities. The 2014 Research Excellence Framework ranked the University 5th in the UK for research excellence. Among its academic staff are two Nobel Laureates, including the winner of the 2007 Nobel Prize for Medicine, Professor Sir Martin Evans. Founded by Royal Charter in 1883, today the University combines impressive modern facilities and a dynamic approach to teaching and research. The University's breadth of expertise encompasses: the College of Arts, Humanities and Social Sciences; the College of Biomedical and Life Sciences; and the College of Physical Sciences and Engineering, along with a longstanding commitment to lifelong learning. Cardiff's flagship Research Institutes are offering radical new approaches to pressing global problems. More at

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