Schizophrenia and Violence: Systematic Review and Meta-Analysis
Publication Date
August 11, 2009
Journal
PLOS Medicine
Authors
Seena Fazel, Gautam Gulati, Louise Linsell, John R. Geddes, et al
Volume
6
Issue
8
Pages
e1000120
DOI
http://doi.org/10.1371/journal.pmed.1000120
Publisher URL
http://journals.plos.org/plosmedicine/article?id=10.1371%2Fjournal.pmed.1000120
PubMed
http://www.ncbi.nlm.nih.gov/pubmed/19668362
PubMed Central
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2718581
Europe PMC
http://europepmc.org/abstract/MED/19668362
Web of Science
000269229800017
Scopus
69349099312
Mendeley
http://www.mendeley.com/research/schizophrenia-violence-systematic-review-metaanalysis
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{"title"=>"Schizophrenia and violence: Systematic review and meta-analysis", "type"=>"generic", "authors"=>[{"first_name"=>"Seena", "last_name"=>"Fazel", "scopus_author_id"=>"7003589504"}, {"first_name"=>"Gautam", "last_name"=>"Gulati", "scopus_author_id"=>"15768808600"}, {"first_name"=>"Louise", "last_name"=>"Linsell", "scopus_author_id"=>"8276805500"}, {"first_name"=>"John R.", "last_name"=>"Geddes", "scopus_author_id"=>"56883972800"}, {"first_name"=>"Martin", "last_name"=>"Grann", "scopus_author_id"=>"7003352398"}], "year"=>2009, "source"=>"PLoS Medicine", "identifiers"=>{"scopus"=>"2-s2.0-69349099312", "pui"=>"355173292", "sgr"=>"69349099312", "pmid"=>"19668362", "issn"=>"15491277", "doi"=>"10.1371/journal.pmed.1000120", "isbn"=>"1549-1676 (Electronic)\\n1549-1277 (Linking)"}, "id"=>"76bcb834-c70f-3276-929d-24047ddd72a3", "abstract"=>"BACKGROUND: Although expert opinion has asserted that there is an increased risk of violence in individuals with schizophrenia and other psychoses, there is substantial heterogeneity between studies reporting risk of violence, and uncertainty over the causes of this heterogeneity. We undertook a systematic review of studies that report on associations between violence and schizophrenia and other psychoses. In addition, we conducted a systematic review of investigations that reported on risk of homicide in individuals with schizophrenia and other psychoses.\\n\\nMETHODS AND FINDINGS: Bibliographic databases and reference lists were searched from 1970 to February 2009 for studies that reported on risks of interpersonal violence and/or violent criminality in individuals with schizophrenia and other psychoses compared with general population samples. These data were meta-analysed and odds ratios (ORs) were pooled using random-effects models. Ten demographic and clinical variables were extracted from each study to test for any observed heterogeneity in the risk estimates. We identified 20 individual studies reporting data from 18,423 individuals with schizophrenia and other psychoses. In men, ORs for the comparison of violence in those with schizophrenia and other psychoses with those without mental disorders varied from 1 to 7 with substantial heterogeneity (I(2) = 86%). In women, ORs ranged from 4 to 29 with substantial heterogeneity (I(2) = 85%). The effect of comorbid substance abuse was marked with the random-effects ORs of 2.1 (95% confidence interval [CI] 1.7-2.7) without comorbidity, and an OR of 8.9 (95% CI 5.4-14.7) with comorbidity (p<0.001 on metaregression). Risk estimates of violence in individuals with substance abuse (but without psychosis) were similar to those in individuals with psychosis with substance abuse comorbidity, and higher than all studies with psychosis irrespective of comorbidity. Choice of outcome measure, whether the sample was diagnosed with schizophrenia or with nonschizophrenic psychoses, study location, or study period were not significantly associated with risk estimates on subgroup or metaregression analysis. Further research is necessary to establish whether longitudinal designs were associated with lower risk estimates. The risk for homicide was increased in individuals with psychosis (with and without comorbid substance abuse) compared with general population controls (random-effects OR = 19.5, 95% CI 14.7-25.8).\\n\\nCONCLUSIONS: Schizophrenia and other psychoses are associated with violence and violent offending, particularly homicide. However, most of the excess risk appears to be mediated by substance abuse comorbidity. The risk in these patients with comorbidity is similar to that for substance abuse without psychosis. Public health strategies for violence reduction could consider focusing on the primary and secondary prevention of substance abuse. Please see later in the article for Editors' Summary.", "link"=>"http://www.mendeley.com/research/schizophrenia-violence-systematic-review-metaanalysis", "reader_count"=>266, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Professor > Associate Professor"=>12, "Librarian"=>2, "Researcher"=>35, "Student > Doctoral Student"=>20, "Student > Ph. D. Student"=>34, "Student > Postgraduate"=>22, "Student > Master"=>46, "Other"=>19, "Student > Bachelor"=>48, "Lecturer"=>5, "Lecturer > Senior Lecturer"=>5, "Professor"=>17}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Professor > Associate Professor"=>12, "Librarian"=>2, "Researcher"=>35, "Student > Doctoral Student"=>20, "Student > Ph. D. Student"=>34, "Student > Postgraduate"=>22, "Student > Master"=>46, "Other"=>19, "Student > Bachelor"=>48, "Lecturer"=>5, "Lecturer > Senior Lecturer"=>5, "Professor"=>17}, "reader_count_by_subject_area"=>{"Unspecified"=>15, "Agricultural and Biological Sciences"=>8, "Philosophy"=>3, "Arts and Humanities"=>1, "Business, Management and Accounting"=>2, "Computer Science"=>2, "Economics, Econometrics and Finance"=>2, "Biochemistry, Genetics and Molecular Biology"=>2, "Nursing and Health Professions"=>2, "Medicine and Dentistry"=>81, "Neuroscience"=>6, "Pharmacology, Toxicology and Pharmaceutical Science"=>1, "Physics and Astronomy"=>1, "Psychology"=>107, "Social Sciences"=>32, "Linguistics"=>1}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>81}, "Social Sciences"=>{"Social Sciences"=>32}, "Physics and Astronomy"=>{"Physics and Astronomy"=>1}, "Psychology"=>{"Psychology"=>107}, "Unspecified"=>{"Unspecified"=>15}, "Pharmacology, Toxicology and Pharmaceutical Science"=>{"Pharmacology, Toxicology and Pharmaceutical Science"=>1}, "Arts and Humanities"=>{"Arts and Humanities"=>1}, "Neuroscience"=>{"Neuroscience"=>6}, "Economics, Econometrics and Finance"=>{"Economics, Econometrics and Finance"=>2}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>8}, "Computer Science"=>{"Computer Science"=>2}, "Business, Management and Accounting"=>{"Business, Management and Accounting"=>2}, "Nursing and Health Professions"=>{"Nursing and Health Professions"=>2}, "Linguistics"=>{"Linguistics"=>1}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>2}, "Philosophy"=>{"Philosophy"=>3}}, "reader_count_by_country"=>{"United States"=>3, "Japan"=>1, "United Kingdom"=>2, "Portugal"=>1, "Switzerland"=>1, "Spain"=>2, "Canada"=>1, "Sweden"=>2, "Austria"=>1, "Belgium"=>1, "Finland"=>1, "Denmark"=>1, "Australia"=>2}, "group_count"=>7}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/887975"], "description"=>"<p>Note: Psychoses studies include individuals with psychotic disorders of both genders with and without substance abuse comorbidity. Substance abuse studies involve risk estimates of violence in individuals of both genders with a diagnosis of substance abuse.</p>", "links"=>[], "tags"=>["estimates", "schizophrenia", "psychoses", "compared", "individuals"], "article_id"=>558430, "categories"=>["Neuroscience", "Cancer", "Mathematics", "Mental Health", "Information And Computing Sciences"], "users"=>["Seena Fazel", "Gautam Gulati", "Louise Linsell", "John R. Geddes", "Martin Grann"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000120.g008", "stats"=>{"downloads"=>2, "page_views"=>4, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Risk_estimates_for_violence_in_schizophrenia_and_other_psychoses_compared_with_risk_in_individuals_with_substance_abuse_/558430", "title"=>"Risk estimates for violence in schizophrenia and other psychoses compared with risk in individuals with substance abuse.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2009-08-11 02:20:30"}
  • {"files"=>["https://ndownloader.figshare.com/files/888135"], "description"=>"a<p>Number of cases differs in this analysis because data were included from Fazel <a href=\"http://www.plosmedicine.org/article/info:doi/10.1371/journal.pmed.1000120#pmed.1000120-Fazel2\" target=\"_blank\">[24]</a>.</p>b<p>Number of studies and cases differs because data from Arseneault <a href=\"http://www.plosmedicine.org/article/info:doi/10.1371/journal.pmed.1000120#pmed.1000120-Arseneault1\" target=\"_blank\">[59]</a> contribute to both cells.</p>c<p>Number of studies is >20 because three studies contributed to more than one cell as the number of cases of the male and female samples differs for Brennan <a href=\"http://www.plosmedicine.org/article/info:doi/10.1371/journal.pmed.1000120#pmed.1000120-Brennan1\" target=\"_blank\">[49]</a>, Fazel <a href=\"http://www.plosmedicine.org/article/info:doi/10.1371/journal.pmed.1000120#pmed.1000120-Fazel3\" target=\"_blank\">[52]</a>, and Wallace <a href=\"http://www.plosmedicine.org/article/info:doi/10.1371/journal.pmed.1000120#pmed.1000120-Wallace2\" target=\"_blank\">[55]</a>.</p>", "links"=>[], "tags"=>["estimates", "sources", "heterogeneity", "studies", "schizophrenia"], "article_id"=>558589, "categories"=>["Neuroscience", "Cancer", "Mathematics", "Mental Health", "Information And Computing Sciences"], "users"=>["Seena Fazel", "Gautam Gulati", "Louise Linsell", "John R. Geddes", "Martin Grann"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000120.t001", "stats"=>{"downloads"=>1, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Risk_estimates_for_possible_sources_of_heterogeneity_in_studies_of_violence_in_individual_with_schizophrenia_and_other_psychoses_/558589", "title"=>"Risk estimates for possible sources of heterogeneity in studies of violence in individual with schizophrenia and other psychoses.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2009-08-11 02:23:09"}
  • {"files"=>["https://ndownloader.figshare.com/files/888070"], "description"=>"<p>Risk estimates for homicide in individuals with schizophrenia and in individuals with substance abuse.</p>", "links"=>[], "tags"=>["estimates", "homicide", "individuals", "schizophrenia"], "article_id"=>558525, "categories"=>["Neuroscience", "Cancer", "Mathematics", "Mental Health", "Information And Computing Sciences"], "users"=>["Seena Fazel", "Gautam Gulati", "Louise Linsell", "John R. Geddes", "Martin Grann"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000120.g009", "stats"=>{"downloads"=>1, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Risk_estimates_for_homicide_in_individuals_with_schizophrenia_and_in_individuals_with_substance_abuse_/558525", "title"=>"Risk estimates for homicide in individuals with schizophrenia and in individuals with substance abuse.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2009-08-11 02:22:05"}
  • {"files"=>["https://ndownloader.figshare.com/files/887281"], "description"=>"<p>Note: Mixed refers to studies where both genders have been included. These estimates are for ORs that are mostly not adjusted for socio-economic factors although Monahan and Wallace have matched cases and controls by neighbourhood of residence and Modestin for occupational level and marital status (see <a href=\"http://www.plosmedicine.org/article/info:doi/10.1371/journal.pmed.1000120#pmed.1000120.s001\" target=\"_blank\">Table S1</a>).</p>", "links"=>[], "tags"=>["estimates", "schizophrenia", "psychoses"], "article_id"=>557734, "categories"=>["Neuroscience", "Cancer", "Mathematics", "Mental Health", "Information And Computing Sciences"], "users"=>["Seena Fazel", "Gautam Gulati", "Louise Linsell", "John R. Geddes", "Martin Grann"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000120.g001", "stats"=>{"downloads"=>3, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Risk_estimates_for_violence_in_schizophrenia_and_other_psychoses_by_gender_/557734", "title"=>"Risk estimates for violence in schizophrenia and other psychoses by gender.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2009-08-11 02:08:54"}
  • {"files"=>["https://ndownloader.figshare.com/files/887690"], "description"=>"<p>Note: Self-report also includes informant-based sources.</p>", "links"=>[], "tags"=>["estimates", "schizophrenia", "psychoses"], "article_id"=>558146, "categories"=>["Neuroscience", "Cancer", "Mathematics", "Mental Health", "Information And Computing Sciences"], "users"=>["Seena Fazel", "Gautam Gulati", "Louise Linsell", "John R. Geddes", "Martin Grann"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000120.g005", "stats"=>{"downloads"=>1, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Risk_estimates_for_violence_in_schizophrenia_and_other_psychoses_by_outcome_measure_/558146", "title"=>"Risk estimates for violence in schizophrenia and other psychoses by outcome measure.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2009-08-11 02:15:46"}
  • {"files"=>["https://ndownloader.figshare.com/files/440096"], "description"=>"<div><h3>Background</h3><p>Although expert opinion has asserted that there is an increased risk of violence in individuals with schizophrenia and other psychoses, there is substantial heterogeneity between studies reporting risk of violence, and uncertainty over the causes of this heterogeneity. We undertook a systematic review of studies that report on associations between violence and schizophrenia and other psychoses. In addition, we conducted a systematic review of investigations that reported on risk of homicide in individuals with schizophrenia and other psychoses.</p><h3>Methods and Findings</h3><p>Bibliographic databases and reference lists were searched from 1970 to February 2009 for studies that reported on risks of interpersonal violence and/or violent criminality in individuals with schizophrenia and other psychoses compared with general population samples. These data were meta-analysed and odds ratios (ORs) were pooled using random-effects models. Ten demographic and clinical variables were extracted from each study to test for any observed heterogeneity in the risk estimates. We identified 20 individual studies reporting data from 18,423 individuals with schizophrenia and other psychoses. In men, ORs for the comparison of violence in those with schizophrenia and other psychoses with those without mental disorders varied from 1 to 7 with substantial heterogeneity (<em>I</em><sup>2</sup> = 86%). In women, ORs ranged from 4 to 29 with substantial heterogeneity (<em>I</em><sup>2</sup> = 85%). The effect of comorbid substance abuse was marked with the random-effects ORs of 2.1 (95% confidence interval [CI] 1.7–2.7) without comorbidity, and an OR of 8.9 (95% CI 5.4–14.7) with comorbidity (<em>p</em><0.001 on metaregression). Risk estimates of violence in individuals with substance abuse (but without psychosis) were similar to those in individuals with psychosis with substance abuse comorbidity, and higher than all studies with psychosis irrespective of comorbidity. Choice of outcome measure, whether the sample was diagnosed with schizophrenia or with nonschizophrenic psychoses, study location, or study period were not significantly associated with risk estimates on subgroup or metaregression analysis. Further research is necessary to establish whether longitudinal designs were associated with lower risk estimates. The risk for homicide was increased in individuals with psychosis (with and without comorbid substance abuse) compared with general population controls (random-effects OR = 19.5, 95% CI 14.7–25.8).</p><h3>Conclusions</h3><p>Schizophrenia and other psychoses are associated with violence and violent offending, particularly homicide. However, most of the excess risk appears to be mediated by substance abuse comorbidity. The risk in these patients with comorbidity is similar to that for substance abuse without psychosis. Public health strategies for violence reduction could consider focusing on the primary and secondary prevention of substance abuse.</p><h3></h3><p><em>Please see later in the article for Editors' Summary</em></p></div>", "links"=>[], "tags"=>["schizophrenia", "systematic", "meta-analysis"], "article_id"=>146749, "categories"=>["Neuroscience", "Cancer", "Mathematics", "Mental Health", "Information And Computing Sciences"], "users"=>["Seena Fazel", "Gautam Gulati", "Louise Linsell", "John R. Geddes", "Martin Grann"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000120", "stats"=>{"downloads"=>15, "page_views"=>29, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Schizophrenia_and_Violence_Systematic_Review_and_Meta_Analysis/146749", "title"=>"Schizophrenia and Violence: Systematic Review and Meta-Analysis", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2009-08-11 01:52:29"}
  • {"files"=>["https://ndownloader.figshare.com/files/887888"], "description"=>"<p>Risk estimates for violence in men with schizophrenia comorbid with substance abuse compared with risk in men with substance abuse (without psychosis) reported in the same study.</p>", "links"=>[], "tags"=>["estimates", "men", "schizophrenia", "comorbid", "compared", "reported"], "article_id"=>558338, "categories"=>["Neuroscience", "Cancer", "Mathematics", "Mental Health", "Information And Computing Sciences"], "users"=>["Seena Fazel", "Gautam Gulati", "Louise Linsell", "John R. Geddes", "Martin Grann"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000120.g007", "stats"=>{"downloads"=>4, "page_views"=>9, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Risk_estimates_for_violence_in_men_with_schizophrenia_comorbid_with_substance_abuse_compared_with_risk_in_men_with_substance_abuse_without_psychosis_reported_in_the_same_study_/558338", "title"=>"Risk estimates for violence in men with schizophrenia comorbid with substance abuse compared with risk in men with substance abuse (without psychosis) reported in the same study.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2009-08-11 02:18:58"}
  • {"files"=>["https://ndownloader.figshare.com/files/887598"], "description"=>"<p>Risk estimates for violence by diagnosis of cases in studies that reported both diagnoses.</p>", "links"=>[], "tags"=>["estimates", "cases", "studies", "reported"], "article_id"=>558053, "categories"=>["Neuroscience", "Cancer", "Mathematics", "Mental Health", "Information And Computing Sciences"], "users"=>["Seena Fazel", "Gautam Gulati", "Louise Linsell", "John R. Geddes", "Martin Grann"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000120.g004", "stats"=>{"downloads"=>0, "page_views"=>1, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Risk_estimates_for_violence_by_diagnosis_of_cases_in_studies_that_reported_both_diagnoses_/558053", "title"=>"Risk estimates for violence by diagnosis of cases in studies that reported both diagnoses.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2009-08-11 02:14:13"}
  • {"files"=>["https://ndownloader.figshare.com/files/887517"], "description"=>"<p>Risk estimates for violence in schizophrenia and other psychoses with substance abuse comorbidity.</p>", "links"=>[], "tags"=>["estimates", "schizophrenia", "psychoses"], "article_id"=>557974, "categories"=>["Neuroscience", "Cancer", "Mathematics", "Mental Health", "Information And Computing Sciences"], "users"=>["Seena Fazel", "Gautam Gulati", "Louise Linsell", "John R. Geddes", "Martin Grann"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000120.g003", "stats"=>{"downloads"=>1, "page_views"=>3, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Risk_estimates_for_violence_in_schizophrenia_and_other_psychoses_with_substance_abuse_comorbidity_/557974", "title"=>"Risk estimates for violence in schizophrenia and other psychoses with substance abuse comorbidity.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2009-08-11 02:12:54"}
  • {"files"=>["https://ndownloader.figshare.com/files/887787"], "description"=>"<p>Risk estimates for violence in schizophrenia and other psychoses by study design.</p>", "links"=>[], "tags"=>["estimates", "schizophrenia", "psychoses"], "article_id"=>558244, "categories"=>["Neuroscience", "Cancer", "Mathematics", "Mental Health", "Information And Computing Sciences"], "users"=>["Seena Fazel", "Gautam Gulati", "Louise Linsell", "John R. Geddes", "Martin Grann"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000120.g006", "stats"=>{"downloads"=>0, "page_views"=>2, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Risk_estimates_for_violence_in_schizophrenia_and_other_psychoses_by_study_design_/558244", "title"=>"Risk estimates for violence in schizophrenia and other psychoses by study design.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2009-08-11 02:17:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/887386"], "description"=>"<p>Risk estimates for violence in schizophrenia and other psychoses with no substance abuse comorbidity.</p>", "links"=>[], "tags"=>["estimates", "schizophrenia", "psychoses"], "article_id"=>557846, "categories"=>["Neuroscience", "Cancer", "Mathematics", "Mental Health", "Information And Computing Sciences"], "users"=>["Seena Fazel", "Gautam Gulati", "Louise Linsell", "John R. Geddes", "Martin Grann"], "doi"=>"https://dx.doi.org/10.1371/journal.pmed.1000120.g002", "stats"=>{"downloads"=>2, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Risk_estimates_for_violence_in_schizophrenia_and_other_psychoses_with_no_substance_abuse_comorbidity_/557846", "title"=>"Risk estimates for violence in schizophrenia and other psychoses with no substance abuse comorbidity.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2009-08-11 02:10:46"}

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Relative Metric

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