• Studies of criminality among patients in psychiatric hospitals and of mental disorder among incarcerated offenders have suggested an association between the major mental disorders (schizophrenia and major affective disorders) and crime. However, these investigations are characterized by notable methodological weaknesses, and, consequently, this conclusion has remained tentative. Little is known about the criminality of intellectually handicapped people. The present study examined the relationship between crime and mental disorder and crime and intellectual deficiency in an unselected Swedish birth cohort followed up to age 30 years. It was found that men with major mental disorders were 21/2 times more likely than men with no disorder or handicap to be registered for a criminal offense and four times more likely to be registered for a violent offense. Women with major disorders were five times more likely than women with no disorder or handicap to be registered for an offense and 27 times more likely to be registered for a violent offense. These subjects committed many serious offenses throughout their lives. The criminal behavior in over half these cases appeared before the age of 18 years. Intellectually handicapped men were three times more likely to offend than men with no disorder or handicap and five times more likely to commit a violent offense. Intellectually handicapped women were almost four times more likely to offend than women with no disorder or handicap and 25 times more likely to commit a violent offense. The results of this investigation confirm and extend previous findings indicating that individuals with major mental disorders and those with intellectual handicaps are at increased risk for offending and for violent offending. However, in the United States, where rates of crime overall and crime by substance abusers are very high, the mentally disordered and intellectually handicapped would account for only a small proportion of these offenses.

https://jamanetwork.com/journals/jamapsychiatry/articlepdf/495755/archpsyc_49_6_009.pdf

Mental Disorder, Intellectual Deficiency, and Crime: Evidence From a Birth Cohort

Background: This epidemiological investigation was designed to examine the relationships between each of the major mental disorders and criminal violence. Specifically, we assessed whether a significant relationship exists between violence and hospitalization for a major mental disorder, and whether this relationship differs for schizophrenia, affective psychoses, and organic brain syndromes. Methods: Subjects were drawn from a birth cohort of all individuals born between January 1, 1944, and December 31, 1947, in Denmark (N = 358 180). Because of the existence of accurate and complete national registers, data were available on all arrests for violence and all hospitalizations for mental illness that occurred for individuals in this cohort through the age of 44 years. Results: There was a significant positive relationship between the major mental disorders that led to hospitalization and criminal violence (odds ratios 2.0-8.8 for men and 3.9-23.2 for women). Persons hospitalized for a major mental disorder were responsible for a disproportionate percentage of violence committed by the members of the birth cohort. Men with organic psychoses and both men and women with schizophrenia were significantly more likely to be arrested for criminal violence than were persons who had never been hospitalized, even when controlling for demographic factors, substance abuse, and personality disorders. Conclusions: Individuals hospitalized for schizophrenia and men hospitalized with organic psychosis have higher rates of arrests for violence than those never hospitalized. This relationship cannot be fully explained by demographic factors or comorbid substance abuse. Arch Gen Psychiatry. 2000;57:494-500

https://jamanetwork.com/journals/jamapsychiatry/articlepdf/481598/yoa8342.pdf

Major mental disorders and criminal violence in a Danish birth cohort.

Background: Evidence has accumulated since the mid 1960s from a number of different countries indicating an association between mental disorder and crime and particularly between the major mental disorders and violence. Registries in Denmark were used to identify a birth cohort and to document all psychiatric admissions and all criminal proceedings of the 324 401 members of this cohort up to the age of 43 years. Methods: Persons who had been admitted to a psychiatric ward were assigned to a diagnostic category according to a hierarchy of principal discharge diagnoses. They were compared with persons never admitted to a psychiatric ward as to the prevalence, type, and frequency of criminal convictions. Results: Women and men who had been hospitalized in psychiatric wards were more likely to have been convicted of a criminal offense than persons with no history of psychiatric hospitalization. The offenders who were hospitalized committed all types and, on average, as many offenses as did the never-hospitalized group of the same sex. Conclusions: These findings confirm those from 2 other post-World War II Scandinavian birth cohorts that have found an association between psychiatric hospitalization and criminal convictions. They also concur with findings that patients discharged from psychiatric wards are more likely than other persons living in the same community to commit crimes and with results from North America showing elevated rates of major mental disorders among incarcerated offenders. Generalization of these findings is limited to nations with similar criminal justice, mental health, and social welfare systems.

Mental disorder and crime. Evidence from a Danish birth cohort.

The potential association between psychosis and violence to others has long been debated. Past research findings are mixed and appear to depend on numerous potential moderators. As such, the authors conducted a quantitative review (meta-analysis) of research on the association between psychosis and violence. A total of 885 effect sizes (odds ratios) were calculated or estimated from 204 studies on the basis of 166 independent data sets. The central tendency (median) of the effect sizes indicated that psychosis was significantly associated with a 49%-68% increase in the odds of violence. However, there was substantial dispersion among effect sizes. Moderation analyses indicated that the dispersion was attributable in part to methodological factors, such as study design (e.g., community vs. institutional samples), definition and measurement of psychosis (e.g., diagnostic vs. symptom-level measurement, type of symptom), and comparison group (e.g., psychosis compared with externalizing vs. internalizing vs. no mental disorder). The authors discuss these findings in light of potential causal models of the association between psychosis and violence, the role of psychosis in violence risk assessment and management, and recommendations for future research.

Psychosis as a risk factor for violence to others: a meta-analysis.

This study compares the neuropsychiatric, intellectual, and educational status of extremely violent and less violent incarcerated boys. The more violent children were more likely to demonstrate psychotic symptomatology (paranoid ideation and rambling, illogical associations) and to have major and minor neurological abnormalities. They were also more likely to have experienced and witnessed extreme physical abuse. The contribution of these factors to violent delinquency is discussed and implications for therapeutic intervention are suggested.

Violent juvenile delinquents: psychiatric, neurological, psychological, and abuse factors.

The authors studied the arrest rates of 867 patients from the Bellevue catchment area who were discharged from the psychiatric division of Bellevue Hospital. They found that the arrest rates of these patients for two years preceding and two years following their admissions to the study were higher than the arrest rates for the general population of the Bellevue catchment area as well as those for 4,601 cities in the United States. They discuss the implications of this finding for the post discharge care of mental patients, particularly in the light of current discharge policies.

Arthur Zitrin

Papers

Crime and violence among mental patients.