Debbie Robson1, Gilda Spaducci2, Ann McNeill3, Duncan Stewart4, Tom J K Craig2, Mary Yates5, Lisa Szatkowski6. 1. Addictions Department, Institute of Psychiatry, Psychology & Neuroscience, King's College London, Denmark Hill, London, UK. Electronic address: deborah.robson@kcl.ac.uk. 2. Health Services and Population Research Department, Institute of Psychiatry, Psychology & Neuroscience, King's College London, De Crespigny Park, London, UK. 3. Addictions Department, Institute of Psychiatry, Psychology & Neuroscience, King's College London, Denmark Hill, London, UK. 4. Mental Health and Addiction Research Group, Department of Health Sciences, University of York, Heslington, York, UK. 5. South London and Maudsley NHS Foundation Trust, Bethlem Royal Hospital, Beckenham, Kent, UK. 6. Division of Epidemiology and Public Health, School of Medicine, University of Nottingham, Nottingham City Hospital, Nottingham, UK; UK Centre for Tobacco and Alcohol Studies, University of Nottingham, Nottingham City Hospital, Nottingham, UK.
Abstract
BACKGROUND: Smoke-free policies are important to protect health and reduce health inequalities. A major barrier to policy implementation in psychiatric hospitals is staff concern that physical violence will increase. We aimed to assess the effect of implementing a comprehensive smoke-free policy on rates of physical assaults in a large UK mental health organisation. METHODS: We did an interrupted time series analysis of incident reports of physical assault 30 months before and 12 months after the implementation of the policy in the inpatient wards of South London and Maudsley National Health Service Foundation Trust, London, UK. We used a quasi-Poisson generalised additive mixed model to model the monthly incidence of physical assaults as a function of several explanatory variables. FINDINGS: 4550 physical assaults took place between April 1, 2012, and Sept 30, 2015; 225 (4·9%) of which were smoking-related. After adjustment for temporal and seasonal trends and key confounders (sex, age, schizophrenia or related disorders, or having been sectioned under the Mental Health Act), there was a 39% reduction in the number of physical assaults per month after the policy introduction compared with beforehand (incidence rate ratio 0·61, 95% CI 0·53-0·70; p<0·0001). INTERPRETATION: Introduction of a comprehensive smoke-free policy appeared to reduce the incidence of physical assaults. Adequately resourced smoke-free policies could be part of broader violence reduction strategies in psychiatric settings. FUNDING: National Institute for Health Research Collaboration for Leadership in Applied Health Research and Care South London (King's College Hospital NHS Foundation Trust).
BACKGROUND: Smoke-free policies are important to protect health and reduce health inequalities. A major barrier to policy implementation in psychiatric hospitals is staff concern that physical violence will increase. We aimed to assess the effect of implementing a comprehensive smoke-free policy on rates of physical assaults in a large UK mental health organisation. METHODS: We did an interrupted time series analysis of incident reports of physical assault 30 months before and 12 months after the implementation of the policy in the inpatient wards of South London and Maudsley National Health Service Foundation Trust, London, UK. We used a quasi-Poisson generalised additive mixed model to model the monthly incidence of physical assaults as a function of several explanatory variables. FINDINGS: 4550 physical assaults took place between April 1, 2012, and Sept 30, 2015; 225 (4·9%) of which were smoking-related. After adjustment for temporal and seasonal trends and key confounders (sex, age, schizophrenia or related disorders, or having been sectioned under the Mental Health Act), there was a 39% reduction in the number of physical assaults per month after the policy introduction compared with beforehand (incidence rate ratio 0·61, 95% CI 0·53-0·70; p<0·0001). INTERPRETATION: Introduction of a comprehensive smoke-free policy appeared to reduce the incidence of physical assaults. Adequately resourced smoke-free policies could be part of broader violence reduction strategies in psychiatric settings. FUNDING: National Institute for Health Research Collaboration for Leadership in Applied Health Research and Care South London (King's College Hospital NHS Foundation Trust).
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