The association between health and prison overcrowding, a scoping review

Abstract It is estimated that the majority of prisons globally are overcrowded. There is consensus that overcrowding leads to negative health outcomes, however quantitative research of this association appears limited. This scoping review aimed to identify literature examining the association betwee...

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Main Authors: Maha Aon, Simon Oberconz, Marie Brasholt
Format: Article
Language:English
Published: BMC 2025-07-01
Series:BMC Public Health
Subjects:
Online Access:https://doi.org/10.1186/s12889-025-23340-9
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author Maha Aon
Simon Oberconz
Marie Brasholt
author_facet Maha Aon
Simon Oberconz
Marie Brasholt
author_sort Maha Aon
collection DOAJ
description Abstract It is estimated that the majority of prisons globally are overcrowded. There is consensus that overcrowding leads to negative health outcomes, however quantitative research of this association appears limited. This scoping review aimed to identify literature examining the association between prison overcrowding and health outcomes, and to summarize these associations. Two databases and a grey literature site were searched for quantitative studies where overcrowding was an independent variable, and the outcome was any physical or mental health issue. This yielded 34 records from 16 mostly high-income countries in addition to three multi-country studies. Studies applied a range of definitions of overcrowding with the most common being occupancy rates. Studies mostly concluded that overcrowding had a positive association on the outcome under study, i.e., as overcrowding increased so did the prevalence of the disease under study. When methodological limitations were taken into consideration, we found that in eighteen articles prison overcrowding was independently and positively associated with tuberculosis, COVID-19, self-harm, depression, overall prison mortality, and injuries due to violence respectively. Prison overcrowding was not found to be independently associated with suicide in four of the five studies where it featured.
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spelling doaj-art-c84b83371a634752ac771e25df3cd79a2025-08-20T03:45:41ZengBMCBMC Public Health1471-24582025-07-0125111310.1186/s12889-025-23340-9The association between health and prison overcrowding, a scoping reviewMaha Aon0Simon Oberconz1Marie Brasholt2Prevention and Accountability Department, DIGNITY - Danish Institute against TorturePrevention and Accountability Department, DIGNITY - Danish Institute against TorturePrevention and Accountability Department, DIGNITY - Danish Institute against TortureAbstract It is estimated that the majority of prisons globally are overcrowded. There is consensus that overcrowding leads to negative health outcomes, however quantitative research of this association appears limited. This scoping review aimed to identify literature examining the association between prison overcrowding and health outcomes, and to summarize these associations. Two databases and a grey literature site were searched for quantitative studies where overcrowding was an independent variable, and the outcome was any physical or mental health issue. This yielded 34 records from 16 mostly high-income countries in addition to three multi-country studies. Studies applied a range of definitions of overcrowding with the most common being occupancy rates. Studies mostly concluded that overcrowding had a positive association on the outcome under study, i.e., as overcrowding increased so did the prevalence of the disease under study. When methodological limitations were taken into consideration, we found that in eighteen articles prison overcrowding was independently and positively associated with tuberculosis, COVID-19, self-harm, depression, overall prison mortality, and injuries due to violence respectively. Prison overcrowding was not found to be independently associated with suicide in four of the five studies where it featured.https://doi.org/10.1186/s12889-025-23340-9PrisonsCrowdingScoping reviewTuberculosisCOVID-19Self-harm
spellingShingle Maha Aon
Simon Oberconz
Marie Brasholt
The association between health and prison overcrowding, a scoping review
BMC Public Health
Prisons
Crowding
Scoping review
Tuberculosis
COVID-19
Self-harm
title The association between health and prison overcrowding, a scoping review
title_full The association between health and prison overcrowding, a scoping review
title_fullStr The association between health and prison overcrowding, a scoping review
title_full_unstemmed The association between health and prison overcrowding, a scoping review
title_short The association between health and prison overcrowding, a scoping review
title_sort association between health and prison overcrowding a scoping review
topic Prisons
Crowding
Scoping review
Tuberculosis
COVID-19
Self-harm
url https://doi.org/10.1186/s12889-025-23340-9
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