Criminal offending and distinguishing features of offenders among persons experiencing a first episode of psychosis

Zipper Pattern: An Investigation into Psychotic Criminal Detection Using EEG Signals

Background: Electroencephalography (EEG) signal-based machine learning models are among the most cost-effective methods for information retrieval. In this context, we aimed to investigate the cortical activities of psychotic criminal subjects by deploying an explainable feature engineering (XFE) model using an EEG psychotic criminal dataset. Methods: In this study, a new EEG psychotic criminal dataset was curated, containing EEG signals from psychotic criminal and control groups. To extract meaningful findings from this dataset, we presented a new channel-based feature extraction function named Zipper Pattern (ZPat). The proposed ZPat extracts features by analyzing the relationships between channels. In the feature selection phase of the proposed XFE model, an iterative neighborhood component analysis (INCA) feature selector was used to choose the most distinctive features. In the classification phase, we employed an ensemble and iterative distance-based classifier to achieve high classification performance. Therefore, a t-algorithm-based k-nearest neighbors (tkNN) classifier was used to obtain classification results. The Directed Lobish (DLob) symbolic language was used to derive interpretable results from the identities of the selected feature vectors in the final phase of the proposed ZPat-based XFE model. Results: To obtain the classification results from the ZPat-based XFE model, leave-one-record-out (LORO) and 10-fold cross-validation (CV) methods were used. The proposed ZPat-based model achieved over 95% classification accuracy on the curated EEG psychotic criminal dataset. Moreover, a cortical connectome diagram related to psychotic criminal detection was created using a DLob-based explainable artificial intelligence (XAI) method. Conclusions: In this regard, the proposed ZPat-based XFE model achieved both high classification performance and interpretability. Thus, the model contributes to feature engineering, psychiatry, neuroscience, and forensic sciences. Moreover, the presented ZPat-based XFE model is one of the pioneering XAI models for investigating psychotic criminal/criminal individuals.

Work engagement, impulsivity and, self-efficacy among Polish workers. Moderating role of impulsivity

The study proposes adding a new component to the Job Demands-Resources Theory, termed 'personal demands'. Impulsivity serves as an illustrative example of personal demands. A cross-sectional questionnaire was conducted and a total of 394 (Female = 59.6%) workers were surveyed. Standardized survey questionnaires were used in the study, i.e. The Utrecht Work Engagement Scale (UWES-9), Life Roles Self-Efficacy Scale (LRSES) and UPPS-P Impulsive Behaviour Scale. The obtained results indicate that Work Engagement correlates negatively with Impulsivity scales (lack of premeditation (r = -.22; p < .001), lack of persistence (r = -.27; p < .001), positive urgency (r = -.12; p, < .01) and negative urgency (r = -.12; p < .01)). In addition, Positive Urgency, moderates the relation between Self-efficacy and Work Engagement, in line with the theory (B = .133; SE = .067; t = 1.98; p < .05; LLCI = .0007; ULCI = 0.2643). This confirmed the fact, that impulsivity should be included in the JDR theory as a 'personal demand'.

Systematic Review and Meta-analysis: Rates of Violence During First-Episode Psychosis (FEP)

BACKGROUND

Most people with psychotic disorders will never commit an act of violence. However, the risk of violence committed by people with schizophrenia is higher than the general population. Violence risk is also known to be highest during the first episode of psychosis compared to later stages of illness. Despite this, there have been no comprehensive reviews conducted in the past 10 years examining rates of violence during FEP. We aimed to provide an updated review of the rate of violence in people with FEP.

STUDY DESIGN

Meta-analytical techniques were used to identify pooled proportions of violence according to severity (less serious, serious, severe) and timing of violence (before presentation, at first presentation, after presentation to services).

STUDY RESULTS

Twenty-two studies were included. The pooled prevalence was 13.4% (95% CI [9.0%-19.5%]) for any violence, 16.3% (95% CI [9.1%-27.4%]) for less serious violence, 9.7% (95% CI [5.4%-17.0%]) for serious violence and 2.7% for severe violence, regardless of time point. The pooled prevalence of any violence was 11.6% (95% CI [6.8%-18.9%]) before presentation, 20.8% (95% CI [9.8%-38.7%]) at first presentation and 13.3% (95% CI [7.3%-23.0%]) after presentation to services.

CONCLUSION

Overall, rates of violence appear to be lower in more recent years. However, due to the high between-study heterogeneity related to study design, the findings must be interpreted with consideration of sample characteristics and other contextual factors. The prevalence of violence remained high at all-time points, suggesting that more targeted, holistic, and early interventions are needed for clinical FEP groups.

The burden for clinical services of persons with an intellectual disability or mental disorder convicted of criminal offences: A birth cohort study of 14,605 persons followed to age 64

BACKGROUND

Intellectual disability (ID), schizophrenia spectrum disorder (SSD), bipolar disorder (BD), substance use disorder (SUD), and other mental disorders (OMDs) are associated with increased risks of criminality relative to sex-matched individuals without these conditions (NOIDMD). To resource psychiatric, addiction, and social services so as to provide effective treatments, further information is needed about the size of sub-groups convicted of crimes, recidivism, timing of offending, antecedents, and correlates. Stigma of persons with mental disorders could potentially be dramatically reduced if violence was prevented.

METHODS

A birth cohort of 14,605 persons was followed to age 64 using data from Swedish national health, criminal, and social registers.

RESULTS

Percentages of group members convicted of violence differed significantly: males NOIDMD, 7.3%, ID 29.2%, SSD 38.6%, BD 30.7%; SUD 44.0%, and OMD 19.3%; females NOIDMD 0.8%, ID 7.7%, SSD 11.2%, BD 2.4%, SD 17.0%, and OMD 2.1%. Violent recidivism was high. Most violent offenders in the diagnostic groups were also convicted of non-violent crimes. Prior to first diagnosis, convictions (violent or non-violent) had been acquired by over 90% of the male offenders and two-thirds of the female offenders. Physical victimization, adult comorbid SUD, childhood conduct problems, and adolescent substance misuse were each associated with increased risks of offending.

CONCLUSION

Sub-groups of cohort members with ID or mental disorders were convicted of violent and non-violent crimes to age 64 suggesting the need for treatment of primary disorders and for antisocial/aggressive behavior. Many patients engaging in violence could be identified at first contact with clinical services.

Early phase psychosis and criminal conviction in United States adults

AIM

Individuals experiencing early phase psychosis (EPP) are at increased risk for legal involvement. In prior studies, between 14% and 75% of individuals with EPP reported a history of criminal offending behaviour, criminal charges, or criminal convictions. To better understand the frequency of criminal conviction in a specialty treatment clinic serving EPP clients, the research team supplemented self-reported data from the clinic intake with information from publicly available databases.

METHODS

In this sample of 309 adults, approximately one quarter of patients (n = 76) self-reported a history of arrest, incarceration, probation, or parole within 6 months of enrolment in a treatment clinic. The research team expanded upon this and collected data from a public database of court proceedings in Indiana for all clinic participants before and after enrolment.

RESULTS

Thirty-nine percent (n = 122) had three or more traffic tickets or a conviction for an ordinance violation, misdemeanour, or felony in the state of Indiana as an adult. This is over two times the national average. Drug and alcohol related convictions were the most common single conviction type, and 29% (n = 89) of subjects experienced at least one incarceration.

CONCLUSIONS

These data highlight the need for specialty clinics to partner with professionals with expertise in the prevention and management of criminal behaviour. Future studies should examine risk factors for individuals experiencing EPP and criminal conviction.

The effect of functional remission and cognitive insight on criminal behavior in patients with schizophrenia

OBJECTıVE: This study was planned to determine the relationship of functional remission with a criminal history and determine its effect on criminal behavior in patients with schizophrenia.

METHODS

This cross-sectional study was conducted with 132 patients with schizophrenia (66 with and 66 without a criminal history). Data were collected between November 2020 and April 2021 using a personal information form, the Functional Remission of General Schizophrenia (FROGS), the Taylor Crime Violence Rating Scale, the Beck Cognitive Insight Scale, and the Positive and Negative Syndrome Scale (PANSS) was used to collect data.

RESULTS

In terms of all scale variables, there were significant differences between the groups with and without a criminal history (p < 0.05). These differences were mostly clearly observed in the FROGS-social functionality (effect size: 16.79), PANSS-positive (effect size: 2.62) and FROGS-health and treatment (effect size: 2) subscales.

CONCLUSIONS

In this study, it was determined that as the symptoms of the illness increased in schizophrenia, the patients' functional remission and insight decreased, and their tendency to commit crimes increased. Psychiatric nurses can plan therapeutic interventions to increase the functionality and insight levels of patients with schizophrenia.

Changes in knowledge, behavioural expectations, self-efficacy, and stigma after an educational campaign about early psychosis for jail correction officers

AIM

Given a lack of interventions to identify and engage individuals with early psychosis in jail and connect them to specialty care in the community upon release, we designed a Targeted Educational Campaign (TEC) for correction officers working in jails. We report on impacts of the TEC on officers' cognitive and attitudinal outcomes.

METHODS

Three different cohorts of officers-totaling n = 451-took part in a survey: 200 at baseline before the TEC began, 123 at 6-months into the TEC, and 128 at 12-months into the TEC. Among each cohort of officers, four constructs were measured: (1) knowledge about early psychosis; (2) self-efficacy around detecting early psychosis and referring to mental health services within the jail; (3) expectations about the benefits of detection and referral to specialty care; and (4) social distance stigma toward detainees with early psychosis.

RESULTS

While exposure to TEC elements was as-planned in the first 6-months, exposure diminished substantially at 12-months, coinciding with increasing fatigue among correction officers due to the COVID-19 pandemic as well as serious staffing shortages. Knowledge, behavioural expectations, and self-efficacy scores improved from baseline to 6-months, with greater exposure to roll-call messages driving scores. Knowledge and behavioural expectations at 12-months were associated with having received an information post card. Social distance stigma worsened across timepoints.

CONCLUSIONS

An educational campaign for jail staff can enhance knowledge, self-efficacy, and behavioural expectations regarding early psychosis, though only while the campaign elements are active. Further research should investigate whether or not social distance stigma or other types of stigma increase alongside improvements.

Cognition, prior aggression, and psychopathic traits in relation to impaired multimodal emotion recognition in psychotic spectrum disorders

Background

Psychopathic traits have been associated with impaired emotion recognition in criminal, clinical and community samples. A recent study however, suggested that cognitive impairment reduced the relationship between psychopathy and emotion recognition. We therefore investigated if reasoning ability and psychomotor speed were impacting emotion recognition in individuals with psychotic spectrum disorders (PSD) with and without a history of aggression, as well as in healthy individuals, more than self-rated psychopathy ratings on the Triarchic Psychopathy Measure (TriPM).

Methods

Eighty individuals with PSD (schizophrenia, schizoaffective disorder, delusional disorder, other psychoses, psychotic bipolar disorder) and documented history of aggression (PSD+Agg) were compared with 54 individuals with PSD without prior aggression (PSD-Agg) and with 86 healthy individuals on the Emotion Recognition Assessment in Multiple Modalities (ERAM test). Individuals were psychiatrically stable and in remission from possible substance use disorders. Scaled scores on matrix reasoning, averages of dominant hand psychomotor speed and self-rated TriPM scores were obtained.

Results

Associations existed between low reasoning ability, low psychomotor speed, patient status and prior aggression with total accuracy on the ERAM test. PSD groups performed worse than the healthy group. Whole group correlations between total and subscale scores of TriPM to ERAM were found, but no associations with TriPM scores within each group or in general linear models when accounting for reasoning ability, psychomotor speed, understanding of emotion words and prior aggression.

Conclusion

Self-rated psychopathy was not independently linked to emotion recognition in PSD groups when considering prior aggression, patient status, reasoning ability, psychomotor speed and emotion word understanding.

Evolution of impulsivity levels in relation to early cannabis use in violent patients in the early phase of psychosis

BACKGROUND

Prevention of violent behaviors (VB) in the early phase of psychosis (EPP) is a real challenge. Impulsivity was shown to be strongly related to VB, and different evolutions of impulsivity were noticed along treatments. One possible variable involved in the relationship between VB and the evolution of impulsivity is cannabis use (CU). The high prevalence of CU in EPP and its relationship with VB led us to investigate: 1/the impact of CU and 2/the impact of early CU on the evolution of impulsivity levels during a 3-year program, in violent and non-violent EPP patients.

METHODS

178 non-violent and 62 violent patients (VPs) were followed-up over a 3 year period. Age of onset of CU was assessed at program entry and impulsivity was assessed seven times during the program. The evolution of impulsivity level during the program, as a function of the violent and non-violent groups of patients and CU precocity were analyzed with linear mixed-effects models.

RESULTS

Over the treatment period, impulsivity level did not evolve as a function of the interaction between group and CU (coef. = 0.02, p = 0.425). However, when including precocity of CU, impulsivity was shown to increase significantly only in VPs who start consuming before 15 years of age (coef. = 0.06, p = 0.008).

CONCLUSION

The precocity of CU in VPs seems to be a key variable of the negative evolution of impulsivity during follow-up and should be closely monitored in EPP patients entering care since they have a higher risk of showing VB.

Non-Indigenous privilege in health, justice and social services preceding first episode psychosis: A population-based cohort study

BACKGROUND

There is evidence of disparities between non-Indigenous and Indigenous incidence of psychotic disorders. Despite these disparities being a clear signpost of the impact of structural racism, there remains a lack of evidence to target institutional factors. We aimed to investigate non-Indigenous and Indigenous differences in government service use prior to first episode diagnosis as a means of identifying points of intervention to improve institutional responses.

METHODS

We used a previously established national New Zealand cohort of 2385 13 to 25-year-old youth diagnosed with psychosis between 2009 and 2012 and a linked database of individual-level multiple government agency administration data, to investigate the differences in health, education, employment, child protection and criminal-justice service use between non-Indigenous (60%) and Indigenous youth (40%) in the year preceding first episode diagnosis. Further comparisons were made with the general population.

RESULTS

A high rate of health service contact did not differ between non-Indigenous and Indigenous youth (adjusted rate ratio 1.0, 95% confidence interval [0.9, 1.1]). Non-Indigenous youth had higher rates of educational enrolment (adjusted rate ratio 1.2, 95% confidence interval [1.1, 1.3]) and employment (adjusted rate ratio 1.2, 95% confidence interval [1.1, 1.3]) and were 40% less likely to have contact with child protection services (adjusted rate ratio 0.6, 95% confidence interval [0.5, 0.8]) and the criminal-justice system (adjusted rate ratio 0.6, 95% confidence interval [0.5, 0.7]). Both first episode cohorts had a higher risk of criminal justice contact compared to the general population, but the difference was greater for non-Indigenous youth (risk ratio 3.0, 95% confidence interval [2.7, 3.4] vs risk ratio 2.0, 95% confidence interval [1.8, 2.2]), explained by the lower background risk.

INTERPRETATION

The results indicate non-Indigenous privilege in multiple sectors prior to first episode diagnosis. Indigenous-based social disparities prior to first episode psychosis are likely to cause further inequities in recovery and will require a response of health, education, employment, justice and political systems.

Could Expanding and Investing in First-Episode Psychosis Services Prevent Aggressive Behaviour and Violent Crime?

OBJECTIVE

Some persons developing, or presenting, schizophrenia engage in aggressive behaviour (AB) and/or criminal offending. Most of these individuals display AB prior to a first episode of psychosis (FEP). In fact, approximately one-third of FEP patients have a history of AB, some additionally display other antisocial behaviours (A+AB). The large majority of these individuals have presented conduct problems since childhood, benefit from clozapine, have extensive treatment needs, and are unlikely to comply with treatment. A smaller sub-group begin to engage in AB as illness onsets. A+AB persists, often for many years in spite of treatment-as-usual, until a victim is seriously harmed. This article proposes providing multi-component treatment programs at FEP in order to prevent aggressive and antisocial behaviours of persons with schizophrenia.

METHOD

Non-systematic reviews of epidemiological studies of AB among persons with schizophrenia, of the defining characteristics of sub-types of persons with schizophrenia who engage in AB and their responses to treatment, and of FEP service outcomes.

RESULTS

Studies have shown that mental health services that simultaneously target schizophrenia and aggressive behaviour are most effective both in reducing psychotic symptoms and aggressive behaviour. Evidence, although not abundant, suggests that a multi-component treatment program that would include the components recommended to treat schizophrenia and cognitive-behavioural interventions to reduce A+AB, and the other factors promoting A+AB such as substance misuse, victimisation, and poor recognition of emotions in the faces of others has the potential to effectively treat schizophrenia and reduce A+AB. Patients with a recent onset of AB would require few components of treatment, while those with prior conduct disorder would require all. Such a program of treatment would be long and intense.

CONCLUSIONS

Trials are needed to test the effectiveness of multi-component treatment programs targeting schizophrenia and A+AB at FEP. Studies are also necessary to determine whether providing such programs in hospitals and/or prisons, with long-term community after-care, and in some cases with court orders to participate in treatment, would enhance effectiveness. Whether investing at FEP would be cost-effective requires investigation.

The Link Between Cannabis Use and Violent Behavior in the Early Phase of Psychosis: The Potential Role of Impulsivity

INTRODUCTION

Recently, the literature has shown that Cannabis Use (CU) was a risk factor for Violent Behavior (VB) in patients with psychosis, and those in the early phase of psychosis (EPP). These findings are relevant because of the high prevalence of CU in this EPP, and the potential for prevention during this phase of illness. However, there is still a lack of clear explanations, supported by empirical evidence, about what underlies the link between CU and VB against other.

METHOD

This viewpoint reviews the scientific literature on the link between CU and VB, and the involvement of impulsivity in this relationship. This last point will be addressed at clinical and neurobiological levels.

RESULTS

Recent studies confirmed that CU is particularly high in the EPP, and is a risk factor for VB in the EPP and schizophrenia. Studies have also shown that impulsivity is a risk factor for VB in psychosis, is associated with CU, and may mediate the link between CU and VB. Research suggests a neurobiological mechanism, as CU affects the structures and function of frontal areas, known to play a role in impulsive behavior.

CONCLUSION

Scientific evidence support the hypothesis of an involvement of impulsivity as a variable that could mediate the link between CU and aggression, particularly, when CU has an early onset. However, this hypothesis should be confirmed with longitudinal studies and by taking into account confounding factors. The studies highlight the relevance of early prevention in the EPP, in addition to interventions focusing on psychotic disorders.

Inpatient early intervention for serious mental illnesses and post-discharge criminal involvement in a high-volume psychiatric hospital setting

Individuals with serious mental illness (SMI) are at increased risk for arrest and incarceration relative to the same-community population without SMI. Publicly-funded inpatient psychiatric hospitals usually feature short lengths of stay and limited opportunities for extended services that might impact criminal justice involvement after discharge. This study examined the influence of an early intervention program for SMI at a high-volume public psychiatric hospital on involvement in the criminal justice system post-discharge. The Early Onset Treatment Program (EOTP) is an extended service intervention program for uninsured patients who are within 5 years of SMI onset. Criminal justice records (number of arrests with conviction, days of incarceration) were obtained for EOTP participants (n = 164) and comparison patients (n = 164) matched on demographics, diagnosis, and discharge date via propensity score matching. Data were zero-inflated and analyzed using hurdle models, controlling for prior arrests. The EOTP group was less likely to be convicted of at least one crime post-discharge (0 arrests vs. > 0, p < .001), and spent fewer days incarcerated (if incarcerated ≥1 day, p < .03). Participation in the EOTP service was linked to reduced likelihood of post-discharge arrest and days incarcerated. Several alternative variables may contribute to this preliminary observation, including length of stay, medication adherence, longer environmental stability, and individual patient characteristics.

Comparing impulsivity in borderline personality, schizophrenia and obsessional-compulsive disorders: Who is ahead?

OBJECTIVE

Impulsivity impacts life domains and in a psychiatric context is often associated with disorders severity and stigmatization. Borderline personality disorder's (BPD), Schizophrenic disorder's (SZD), and obsessional compulsive disorder's (OCD) impulsivity issues relate to worse prognosis. This study aims to compare these disorders assessing their proneness to impulsivity and urgency.

METHODS

We recruited 90 patients among them OCD (n = 25), SZD (n = 23), and BPD (n = 50), and 24 healthy control participants (HC). We assessed the diagnosis according and measured the impulsivity level.

RESULTS

Our results showed that BPD was significantly more impulsive than HC, SZD, and OCD. HC, SZD, and OCD being equivalent on their global Urgency-Premeditation-Perseverance-Sensation seeking scores. For urgency, BPD was also superior to others, OCD was superior to HC, but SZD and HC were equivalent. The urgency was correlated to SZD's scale for SZD, no link appeared between borderline personality questionnaire and Yale-Brown Obsessive-Compulsive Scale's score.

CONCLUSION

These results question the existent literature relating impulsivity and SZD.

Aggressive and Disruptive Behavior Among Psychiatric Patients With Major Depressive Disorder, Schizophrenia, or Alcohol Dependency and the Effect of Depression and Self-Esteem on Aggression

Aggressive and disruptive behavior in inpatient settings poses a serious challenge for clinical staff and fellow patients. Hence, the aim of this study was to identify different aspects of aggressive and disruptive behavior in the context of an aberrant self-esteem or clinically manifested depression as potentially influencing factors. We collected self-reported data from 282 psychiatric patients [ICD-10 diagnoses for alcohol dependency, schizophrenia or major depressive disorder (MDD)] and compared it to healthy norm groups. As expected, all three patient groups scored higher in the aggression questionnaires than the norm group. Specifically, patients with MDD exhibited significantly higher externally directed aggression, reactive aggression, and irritability compared to controls. Patients with schizophrenia displayed higher irritability, while all three groups showed distinctly higher self-aggressiveness than healthy persons. We found a lower inhibition of aggression in alcohol dependent subjects compared to both the patient groups and the norm sample. Yet, the higher the self-esteem among alcohol dependent and MDD patients, the lower were their aggression scores; similarly, a lower self-esteem among patients diagnosed with schizophrenia resulted in heighten self-aggressiveness. Thus, our data suggests that therapeutic interventions for strengthening self-esteem in patients with a diagnosis of MDD, alcohol dependency or schizophrenia could reduce certain aspects of aggressive behavior. Therefore, it seems conceivable that strengthening self-esteem in psychiatric patients could contribute to the prevention of violence in clinical practice.

First diagnosis of psychosis in the prison: results from a data-linkage study

BACKGROUND

Psychosis is more prevalent among people in prison compared with the community. Early detection is important to optimise health and justice outcomes; for some, this may be the first time they have been clinically assessed.

AIMS

Determine factors associated with a first diagnosis of psychosis in prison and describe time to diagnosis from entry into prison.

METHOD

This retrospective cohort study describes individuals identified for the first time with psychosis in New South Wales (NSW) prisons (2006-2012). Logistic regression was used to identify factors associated with a first diagnosis of psychosis. Cox regression was used to describe time to diagnosis from entry into prison.

RESULTS

Of the 38 489 diagnosed with psychosis for the first time, 1.7% (n = 659) occurred in prison. Factors associated with an increased likelihood of being diagnosed in prison (versus community) were: male gender (odds ratio (OR) = 2.27, 95% CI 1.79-2.89), Aboriginality (OR = 1.81, 95% CI 1.49-2.19), older age (OR = 1.70, 95% CI 1.37-2.11 for 25-34 years and OR = 1.63, 95% CI 1.29-2.06 for 35-44 years) and disadvantaged socioeconomic area (OR = 4.41, 95% CI 3.42-5.69). Eight out of ten were diagnosed within 3 months of reception.

CONCLUSIONS

Among those diagnosed with psychosis for the first time, only a small number were identified during incarceration with most identified in the first 3 months following imprisonment. This suggests good screening processes are in place in NSW prisons for detecting those with serious mental illness. It is important these individuals receive appropriate care in prison, have the opportunity to have matters reheard and possibly diverted into treatment, and are subsequently connected to community mental health services on release.

DECLARATION OF INTEREST

None.

Violent behaviour in early psychosis patients: Can we identify clinical risk profiles?

AIMS

The objective of this study is to explore, within a sample of early psychosis patients (EPP), if subgroups regarding rate of violent behaviour (VB) against others can be identified on the basis of dynamic risk factors (treatment modifiable characteristics).

METHODS

In a sample of 265 EPP, treated at the Treatment and Early Intervention in Psychosis Program in Lausanne, we conducted a latent-class analysis on the basis of the main dynamic VB risk factors (substance use disorder [SUD], positive symptoms, insight, and impulsivity). VB were restricted to "serious violence" and were assessed through patients self-report, interview with relatives or forensic services and with a standardized instrument.

RESULTS

The analysis confirmed the heterogeneity of the sample regarding rate of VB. Patients could be stratified within 4 subgroups, 3 of which were at increased risk of VB. The two groups with the highest rates of VB displayed specific clinical profiles. The first one was characterized by high levels of impulsivity, hostility, positive symptoms and SUD, and the second, by low level of insight and low social functioning. These patterns suggest that significant difficulties in social interaction may contribute to the emergence of aggressive reactions against others.

CONCLUSIONS

Identification of EPP at increased risk of VB seems possible on the basis of dynamic risk factors. If confirmed prospectively, this could pave the way to the development of preventive strategies and specific interventions.

[Three clinical risk profiles of violent behavior in a cohort of early psychosis patients]

OBJECTIVE

This study aims to determine whether it is possible to identify clinical profiles at risk of violent behaviors (VB) in the early phase of psychotic disorders, on the basis of the main dynamic psychopathological risk factors and describe characteristics of the groups with highest levels of violent behaviors.

METHOD

A total of 265 patients, aged 18 to 35, treated at the Treatment and early Intervention in Psychosis Program (TIPP-Lausanne), a specialized early psychosis program, were included in this study. We conducted a latent-class analysis and a discriminative analysis on the basis of the main dynamic VB risk factors: substance use disorder, impulsivity, positive symptoms, insight, aggression, hostility, anger, emotional instability and adherence to treatment. These factors were evaluated by specialized scales and on the basis of the Positive and Negative Syndrome Scale (PANSS). VB were restricted to physical aggression against people, defined as "serious violence". They were assessed on the basis of a questionnaire listing violent offenses (Swiss Criminal Code) and VB such as assault and battery, information through the forensic psychiatric services and on the basis of the Staff Observation Aggression Scale (SOAS-R scale) during inpatient treatment phase.

RESULTS

Four heterogeneous subgroups were identified with respect to the studied clinical characteristics, including two groups with high rates of VB. The first group, comprising 46% of patients with VB, is distinguished by the prevalence of a range of dimensions related to hostility, impulsivity and emotional instability, associated with high levels of substance abuse and positive symptoms. These clinical dimensions are very significant at the statistical level, since they explain 70% of the construction of subgroups (discriminant analysis). The second group with 37% of patients with VB, is characterized by a lack of insight, lack of adherence to treatment and substance use. These two clinical profiles could increase the impairment of cognitive, functional and relational abilities and contribute to the development of VB in this early phase of psychosis. The third subgroup, with a violent behaviors rate of 28.6%, is distinguished by its high proportion of diagnoses of substance abuse (100%) and women (54%). A last subgroup of patients, the largest quantitatively, has a low proportion of VB (15%) and the lowest levels on the studied factors, suggesting that the majority of patients with this profile commit few VB.

CONCLUSION

Our results show that it is possible to identify groups at risk of violent behaviors during the early phase of psychosis on the basis of clinical characteristics that may evolve and therefore be the focus of preventive care. These results highlight the need to target substance use, impulsivity and lack of insight at follow-up in order to prevent VB.

The Relationship Between Severe Mental Disorders and Recidivism in a Sample of Women Released from Prison

Women are one of the fastest growing sectors of the prison population, and have different pathways into prison and differing needs during the reentry process when compared to men (Cloyes et al. J Forensic Nurs; 6:3-14, 2010b; Herrschaft et al. J Offender Rehabil; 48:463-482, 2009). Women report higher levels of mental health problems overall, and report more severe symptomatology (Cloyes et al. J Forensic Nurs; 6:3-14, 2010a; Hyde 2012; Lynch et al. 2014). The current study focuses on the role of severe mental disorders for women released from prison. Data collected from the North Carolina Division of Adult Correction and Juvenile Justice were used to analyze the specific role of severe mental disorders in women's recidivism at eight years post-release (n = 2311). Approximately 20% of women in this sample met the criteria for diagnosis with a severe mental disorder (SMD). Logistic regression analysis indicated that there was an association between SMDs and recidivism for this sample only (p = .11). Cox regression analyses indicated that women diagnosed with SMDs were 16% more likely to have recidivated at eight years post-release compared with women who were not diagnosed with an SMD (p < .05). Implications for the recognition, role, and treatment of SMDs during reentry are discussed.

Violent offending in schizophrenia spectrum disorders preceding and following diagnosis

OBJECTIVE

People affected by schizophrenia spectrum disorders are at a higher risk of offending violently. This study aims to investigate risk factors in relation to the peri-diagnostic period and possible predictors of post-diagnostic violence of people diagnosed for the first time in the public mental health system.

METHODS

The study compared various risk factors for post-diagnostic violence in patients ( n = 1453) diagnosed with a schizophrenia spectrum disorder. Patients were grouped according to the occurrence of peri-diagnostic violence. Of the 246 violent offenders, 164 committed their first offence pre-diagnosis. Mental health and criminological variables were evaluated across the lifespan (median age at end of follow-up = 34.22 years, range = 17.02-55.80 years).

RESULTS

Gender, employment, non-violent offending, family incidents, violent and non-violent victimisation, substance use, personality disorder, number of in-patient admissions and history of non-compliance differed significantly across violent and non-violent subgroups (all p ⩽ 0.01 and at least small effect size). More frequent and longer inpatient admissions were found in the violent subgroups (all p ⩽ 0.01). For the whole sample, sex, number of violent offences, non-violent offences, violent victimisation, substance use and number of inpatient admissions predicted post-diagnostic violence (χ² (6) = 188.13, p < 0.001). Among patients with a history of pre-diagnostic violence, a history of non-violent offending in the 18-month period pre-diagnosis was the strongest predictor of future violence (odds ratio = 3.08, 95% confidence interval [1.32, 7.21]).

CONCLUSION

At triage, violence risk assessment should consider the presence of antisocial behaviour and violent victimisation, substance use, male gender and frequency of inpatient admissions. Common treatment targets for the prevention of post-diagnostic violence include criminality and victimisation. Treatment of positive symptoms should be of greater emphasis for individuals without a history of pre-diagnostic violence.

Sensorimotor gating characteristics of violent men with comorbid psychosis and dissocial personality disorder: Relationship with antisocial traits and psychosocial deprivation

Evidence suggests violence amongst those with psychosis is not aetiologically homogeneous, and that a large proportion of those who engage in violent behaviour have a comorbid antisocial personality disorder. Initial investigations indicate that this subgroup has distinct historical and neuropsychological characteristics, which may indicate diverse treatment needs. This study investigated sensorimotor gating characteristics of violent men with diagnoses of both psychosis and dissocial personality disorder (DPD) (n=21) relative to violent men with psychosis alone (n=12), DPD alone (n=14) and healthy, non-violent male controls (n=27), using the prepulse inhibition (PPI) paradigm. The results indicated that, relative to the psychosis alone and healthy control groups, the comorbid group had lower PPI, especially at 60-ms prepulse-to-pulse interval. The DPD group took an intermediary position and did not differ from any group. Antisocial personality traits (factor two scores of the Psychopathy Checklist - Revised), and greater severity of childhood psychosocial deprivation (including physical and sexual abuse), were significantly correlated with poor PPI across the clinical sample. The findings suggest diverse sensorimotor gating profiles amongst subgroups of violent offenders, with comorbid psychosis and DPD showing most impairment. This is consistent with a 'double dose' of deficit explanation amongst those with both diagnoses, explained at least in part by presence of antisocial personality traits and childhood psychosocial deprivation.

[Insight and Violent Behavior in a Cohort of Early Psychosis Patients]

OBJECTIVES:

An important proportion of patients with first episode psychosis behave in a violent, hetero-aggressive manner. This study aims to explore the association between insight and violent behavior (VB), and insight evolution in the follow-up period.

METHOD:

The study was carried out with a prospective cohort of 265 patients recruited from the early treatment and intervention for psychotic disorders program, and followed for a 3-year period. Insight assessing is based on a 3-item scale and the insight item in Positive and Negative Syndrome Scale (PANSS). VBs were evaluated by case managers, information from forensic services and through a record of VBs noted during hospitalization. Univariate and multivariate logistic regression analyses, t-tests and correlations were conducted.

RESULTS:

The significant effect of insight as a factor associated with VBs that was found in univariate analyses disappears after controlling for the effect of positive symptoms, substance addiction diagnosis, impulsivity and treatment compliance.

CONCLUSION:

If patient insight in their illness develops positively during treatment, our results suggest that the risk of VBs occurring is not influenced by insight level. On the other hand, it is significantly linked to substance abuse and impulsivity, which might implicate focusing on these 2 dimensions in preventive strategies. Insight impact on VB should be further explored in more focused prospective analyses.

Aggressive Behavior Among Persons With Schizophrenia and Those Who Are Developing Schizophrenia: Attempting to Understand the Limited Evidence on Causality

People with, and those who are developing, schizophrenia are at increased risk to engage in aggressive behavior (AGB). Some incidents lead to criminal prosecution. Most people with schizophrenia who commit crimes engage in delinquency and/or AGB prior to first episode. A large proportion of these individuals have a history of childhood conduct disorder (CD) and brain abnormalities suggestive of abnormal neural development distinctive from that of others with schizophrenia. Factors contributing to schizophrenia that is preceded by CD include failing to learn not-to-behave aggressively in early childhood, impairments in understanding emotions in the faces of others, maltreatment, and subsequent re-victimization. Others with no history of antisocial behavior begin engaging in AGB as positive symptoms increase and illness onsets. They too are at elevated risk to be victimized. Specific genetic variants linked to stress regulation in combination with adversity have been associated both with AGB and psychotic symptoms. Effectively treating conduct problems and preventing victimization would reduce AGB by persons with schizophrenia.

New Clinically Relevant Findings about Violence by People with Schizophrenia

OBJECTIVE

To review findings with clinical relevance that add to knowledge about antisocial and aggressive behaviour among persons with schizophrenia.

METHOD

Nonsystematic literature review.

RESULTS

Recent evidence shows that individuals who develop schizophrenia present cognitive deficits, psychotic-like experiences, and internalizing and externalizing problems from childhood onwards. Many of their relatives present not only schizophrenia-related disorders but also antisocial behaviour. While the increased risk of aggressive behaviour among persons with schizophrenia has been robustly established, recent findings show that by first contact with clinical services for psychosis, most people with schizophrenia who will engage in aggressive behaviour may be identified. At first episode, 2 distinct types are distinguishable: those who present a history of antisocial and aggressive behaviour since childhood and those who began engaging in aggressive behaviour as illness onsets. Antipsychotic medications and other treatments shown to be effective for schizophrenia are needed by both types of patients. Additionally, those with a history of antisocial and aggressive behaviour since childhood require cognitive-behavioural programs aimed at reducing these behaviours and promoting prosocial behaviour. Reducing physical victimisation and cannabis use will likely reduce aggressive behaviour. Evidence suggests that threats to hurt others often precede assaults.

CONCLUSIONS

At first contact with services, patients with schizophrenia who have engaged in aggressive behaviour should be identified and treated for schizophrenia and for aggression. Research is needed to identify interactions between genotypes and environmental factors, from conception onwards, that promote and that protect against the development of aggressive behaviour among persons with schizophrenia.

Individuals developing schizophrenia are hidden among adolescent substance misusers

BACKGROUND

Strategies are needed to identify youth developing schizophrenia. The present study aimed to determine whether adolescents treated for substance misuse were at elevated risk to develop schizophrenia, whether this risk has changed since the late 1960s, and whether substance misuse in adolescence predicted poorer outcomes through adulthood.

METHOD

In a Swedish city, since the mid-1960s there has been only one clinic for adolescent substance misuse. Three samples from this clinic were studied: 1992 individuals treated from 1968 to 1971 followed to age 50 years; 1576 treated from 1980 to 1984 followed to age 35 years; and 180 treated in 2004 followed to age 22 years. Each clinical sample was matched on age, sex and place of birth to an equal, or larger, number of randomly selected individuals from the general population. Schizophrenia, substance use disorders, physical disorders related to substance misuse, criminal convictions, poverty and death were identified using national registers.

RESULTS

Individuals treated for substance misuse in adolescence were at increased risk to subsequently develop schizophrenia: in males the increase was approximately four-fold and in females between five- and seven-fold. There was no difference in risk for those treated in 1968-1971 and from 1980 to 1984 when cannabis use increased from 37.6% to 49.8% of the clinical samples. Among males who developed schizophrenia, treatment for substance misuse was associated with increased risk of substance use disorders and criminal convictions through adulthood.

CONCLUSIONS

Treatment programmes for adolescents misusing substances include a disproportionate number developing schizophrenia. Early detection and treatment have the potential to improve long-term outcomes.

Non-pharmacological interventions for reducing aggression and violence in serious mental illness: A systematic review and narrative synthesis

BACKGROUND

For people with mental illness that are violent, a range of interventions have been adopted with the aim of reducing violence outcomes. Many of these interventions have been borrowed from other (offender) populations and their evidence base in a Serious Mental Illness (SMI) population is uncertain.

AIMS

To aggregate the evidence base for non-pharmacological interventions in reducing violence amongst adults with SMI and PD (Personality Disorder), and to assess the efficacy of these interventions. We chose to focus on distinct interventions rather than on holistic service models where any element responsible for therapeutic change would be difficult to isolate.

METHODS

We performed a systematic review and narrative synthesis of non-pharmacological interventions intended to reduce violence in a SMI population and in patients with a primary diagnosis of PD. Five online databases were searched alongside a manual search of seven relevant journals, and expert opinion was sourced. Eligibility of all returned articles was independently assessed by two authors, and quality of studies was appraised via the Cochrane Collaboration Tool for Assessing Risk of Bias.

RESULTS

We included 23 studies of diverse psychological and practical interventions, with a range of experimental and quasi-experimental study designs that included 7 Randomised Controlled Trials (RCTs). The majority were studies of Mentally Disordered Offenders. The stronger evidence existed for patients with a SMI diagnosis receiving Cognitive Behavioural Therapy or modified Reasoning & Rehabilitation (R&R). For patients with a primary diagnosis of PD, a modified version of R&R appeared tolerable and Enhanced Thinking Skills showed some promise in improving attitudes over the short-term, but studies of Dialectical Behaviour Therapy in this population were compromised by high risk of experimental bias. Little evidence could be found for non-pharmacological, non-psychological interventions.

CONCLUSIONS

The evidence for non-pharmacological interventions for reducing violence in this population is not conclusive. Long-term outcomes are lacking and good quality RCTs are required to develop a stronger evidence base.

History of offending behavior in first episode psychosis patients: a marker of specific clinical needs and a call for early detection strategies among young offenders

OBJECTIVES

Previous literature suggests that early psychosis (EP) patients with a history of offending behavior (HOB) have specific clinical needs. The aims of this study were to assess: (1) the prevalence of HOB in a representative sample of EP; (2) the premorbid and baseline characteristics of patients with HOB, and (3) the potential differences in short-term outcome of such patients when compared to patients without HOB.

METHODS

The Early Psychosis Prevention and Intervention Centre (EPPIC) admitted 786 EP patients between 1998 and 2000. Data were collected from patients' files using a standardized questionnaire. Data of 647 patients could be analyzed.

RESULTS

HOB patients (29% of the sample) were more likely to be male with lower level of premorbid functioning and education, have used illicit substances and have attempted suicide. They presented with a more complex clinical picture and had poorer 18-month outcome. Most importantly, they had a significantly longer duration of untreated psychosis.

CONCLUSIONS

On the basis of the high prevalence and specific features of EP patients with HOB, our study confirms a need for additional research in this domain and for the development of specific treatment strategies. Most importantly, it suggests a need for the promotion of early detection strategies among the populations of young offenders, considering that some of them may be going through the early phases of a psychotic disorder and that reduction of treatment delay and provision of well adapted interventions may have a significant impact at numerous levels in such patients.

Violence and crime among male inpatients with severe mental illness: attempting to explain ethnic differences

BACKGROUND

Studies report that in the U.K., among men with severe mental illness (SMI), those of black Caribbean ethnicity display increased risk of aggressive behaviour, criminal convictions, and schizophrenia. The study aimed to compare aggressive behaviour and criminal convictions among men with SMI of white British, black Caribbean and black African ethnicity, and to explore factors associated with differences across ethnicities.

METHOD

Sample 1 included 1,104 male inpatients with SMI. Sample 2 included a representative sub-sample of 165 who completed interviews, and authorized access to medical and criminal files. Ethnicity was self-ascribed.

RESULTS

Staff-rated violence prior to admission, self-reported aggressive behaviour, and convictions for non-violent and violent crimes differed among men with SMI of different ethnicities. Relative to men with SMI of white British ethnicity, those of black African ethnicity showed decreased risk of aggressive behaviour, and those of black Caribbean ethnicity showed elevated risk of convictions for non-violent, and marginally, for violent crimes. Relative to men with SMI of black African ethnicity, those of black Caribbean ethnicity showed elevated risk of aggressive behaviour and criminal convictions. Proportionately more of the men of both black African and black Caribbean ethnicity, than those of white British ethnicity, presented schizophrenia spectrum disorders. Multivariate analyses failed to identify factors that would explain differences in aggressive behaviour, and criminal convictions across ethnic groups.

CONCLUSIONS

Differences in four different measures of aggressive and antisocial behaviour among men with SMI of different ethnicities were observed but factors associated with these differences were not found.

Violence and duration of untreated psychosis in first-episode patients

BACKGROUND

Violent behaviour can be a presenting sign of first-episode psychosis. Duration of untreated psychosis (DUP) has been a focus of attention because it is a potentially modifiable factor that may influence outcome.

AIMS

The aim was to review the literature addressing the following issues: prevalence of violence or aggression in the first episode of psychosis, violence or aggression during the periods before and after the initiation of treatment, the DUP and relation between DUP and the level of violence or aggression in first-episode psychosis.

METHODS

MEDLINE and PubMed databases were searched for articles using the combination of key words 'aggression' (limited to humans) and 'first episode' and 'psychosis'.

RESULTS

Available evidence suggests that the prevalence of violent behaviour in the first episode of psychosis, particularly schizophrenia, is greater than during the later stages of the illness. First-episode psychosis is associated with an increased risk of homicide. There is some limited support for an effect of DUP length on serious violence or aggression. Violent behaviour frequently develops before the onset of first episode. Substance use disorders are additional factors that elevate the risk for violence in these patients.

CONCLUSIONS

Earlier treatment of first episode psychosis might prevent some homicides. Personality factors and substance abuse may be more important than psychotic symptoms in the development of aggressive behaviour in patients with first-episode psychosis.

Aggression in Psychoses

Most individuals diagnosed with a mental illness are not violent, but some mentally ill patients commit violent acts. PubMed database was searched for articles published between 1980 and November 2013 using the combination of key words “schizophrenia” or “bipolar disorder” with “aggression” or “violence.” In comparison with the general population, there is approximately a twofold increase of risk of violence in schizophrenia without substance abuse comorbidity and ninefold with such comorbidity. The risk in bipolar disorder is at least as high as in schizophrenia. Most of the violence in bipolar disorder occurs during the manic phase. Violence among adults with schizophrenia may follow two distinct pathways: one associated with antisocial conduct and another associated with the acute psychopathology, particularly anger and delusions. Clozapine is the most effective treatment of aggressive behavior in schizophrenia. Emerging evidence suggests that olanzapine may be the second most effective treatment. Treatment nonadherence greatly increases the risk of violent behavior, and poor insight as well as hostility is associated with nonadherence. Nonpharmacological methods of treatment of aggression in schizophrenia and bipolar disorder are increasingly important. Cognitive behavioral approaches appear to be effective in cases where pharmacotherapy alone is not sufficient.

Violence among people with schizophrenia: phenotypes and neurobiology

People with schizophrenia are at increased risk, as compared to the general population, to acquire convictions for violent crimes and homicide. They also show elevated levels of aggressive behaviour. While psychotic symptoms explain aggressive behaviour that is common during acute episodes, they do not explain such behaviour at other stages of illness or prior to illness onset. Three distinct phenotypes have been identified: individuals with a childhood onset of conduct disorder who display antisocial and aggressive behaviour both before and after schizophrenia onset; individuals with no history of conduct problems who begin engaging in aggressive behaviour as illness onsets; and individuals who after many years of illness engage in a severe physical assault. Little is known about the aetiology of the three types of offenders and about the neural mechanisms that initiate and maintain these behaviours. We hypothesize that schizophrenia preceded by conduct disorder is associated with a combination of genes conferring vulnerability for both disorders and altering the effects of environmental factors on the brain, and thereby, with a distinct pattern of neural development. Some evidence is available to support this hypothesis. By contrast, offending among adults with schizophrenia who have no history of such behaviour prior to illness may result from the changes in the brain that occur as illness onsets, and that are further altered by comorbid conditions such as substance misuse, or by the progressive changes in the brain through adulthood that may result from the illness and from the use of antipsychotic medications.

A systematic review and meta-regression analysis of aggression during the first episode of psychosis

OBJECTIVE

The First Episode of Psychosis (FEP) represents a period of heightened risk for aggression. However, it is not known whether this risk is significantly altered following contact with mental health services.

METHOD

Meta-analytic methods were used to estimate pooled prevalence of 'any' and 'serious' aggression during FEP, while meta-regression analyses were conducted to explore reasons for heterogeneity between studies.

RESULTS

Fifteen studies comprising 3, 294 FEP subjects were analysed. Pooled prevalence of 'any aggression' before service contact was 28% (95% CI: 22-34) and following contact 31% (95% CI: 20-42). Pooled prevalence of 'serious aggression' was 16% (95% CI: 11-20) before service contact and 13% (95% CI: 6-20) following contact. Four studies reporting repeated assessments within the same cohort revealed that aggression rates did not significantly differ post and pre service contact: Odds Ratios for any aggression: 1.18 (95% CI: 0.46-2.99) and serious aggression: 0.61 (95% CI: 0.31-1.21).

CONCLUSION

Rates of aggression are high during FEP, both before and following initial service contact, and seem not to alter following contact. This conclusion remains tentative due to considerable heterogeneity between studies and a lack of prospective cohort studies.

A whole-of-population study of the prevalence and patterns of criminal offending in people with schizophrenia and other mental illness

BACKGROUND

Large epidemiological studies are needed to better understand the prevalence and profile of offending by people with mental illness. This study used a whole-of-population design to examine the prevalence, type and pattern of offending across all psychiatric diagnoses, including schizophrenia, compared to the general population. Method We used whole-of-population longitudinal record-linked data for a cohort of all Western Australians born 1955-1969 to determine arrest history over the period 1985-1996 and to ascertain recorded history of psychiatric illness. Of the cohort, 116 656 had been arrested and 40 478 were on the psychiatric case register.

RESULTS

The period prevalence of arrest for people with any psychiatric illness was 32.1%. The highest arrest prevalence, by diagnostic category, was for substance use disorders (59.4%); the prevalence for schizophrenia was 38.7%. Co-morbid substance use disorders significantly increased risk of arrest in people with schizophrenia. The prevalence of mental illness among offenders was 11.1%: 6.5% of offenders had substance use disorders and 1.7% had schizophrenia. For the majority of offenders with a psychiatric illness, first arrest preceded first contact with mental health services; for schizophrenia only, this proportion was increasing over time. The mean percentage annual change in the number of arrests during 1985-1996 rose significantly for offenders with a psychiatric illness other than schizophrenia and dropped significantly for those with no mental illness. Compared to non-psychiatric offenders, offenders with schizophrenia were more likely to offend alone, to offend in open places and to target strangers.

CONCLUSIONS

Our findings open the way to an informed approach to the management of offenders with mental illness.

Executive functioning deficits and childhood trauma in juvenile violent offenders in China

A large body of evidence indicates that violent offenders have executive functioning deficits. However, previous studies have not considered childhood trauma, which is likely to influence the executive functioning of violent offenders. The aim of the present study was to compare the difference of executive functioning among juvenile violent offenders, with non-violent offenders and normal controls, and then to analyse whether executive functioning was affected independently of childhood trauma. In addition to using a battery of tests assessing executive functioning including the Intra/Extradimensional Shift Test(IED), the Stockings of Cambridge Test (SOC), and the Spatial Working Memory Test (SWM) from the Cambridge Automated Neuropsychological Testing Battery (CANTAB), the short form of the Chinese Revision of the Wechsler Adult Intelligence Scale (WAIS-RC) and Childhood Trauma Questionnaire-28 item Short Form (CTQ) were also used among 107 violent offenders, 107 non-violent offenders and 107 normal controls. Our results showed that both offender groups obtained significantly lower estimated Intelligence Quotient (IQ) scores and experienced more childhood trauma than did normal controls. Violent offenders showed impaired executive functioning on tasks of attention set-shifting, working memory and planning. Finally, spatial working memory (SWM) deficits, particularly SWM strategy scores, may be associated with childhood trauma.

Offending prior to first psychiatric contact: a population-based register study

BACKGROUND

There is a well-established association between psychotic disorders and subsequent offending but the extent to which those who develop psychosis might have a prior history of offending is less clear. Little is known about whether the association between illness and offending exists in non-psychotic disorders. The aim of this study was to determine whether the association between mental disorder and offending is present prior to illness onset in psychotic and non-psychotic disorders.

METHOD

In a nested case-control study, cases (n=101,890) with a first psychiatric contact during the period 1995 to 2006 were identified and matched by age and gender to population-based controls (n=2,236,195). Exposure was defined as prior criminal and violent offending.

RESULTS

Males with one offence had an incidence rate ratio (IRR) of 2.32 [95% confidence interval (CI) 2.26-2.40] for psychiatric admission whereas two or more convictions yielded an IRR of 4.97 (95% CI 4.83-5.11). For violent offending the associations were stronger and IRRs of 3.97 (95% CI 3.81-4.12) and 6.18 (95% CI 5.85-6.52) were found for one and several offences respectively. Estimates for females were of a similar magnitude. The pattern was consistent across most diagnostic subgroups, although some variability in effect sizes was seen, and persisted after adjustment for substance misuse and socio-economic status (SES).

CONCLUSIONS

A prior history of offending is present in almost one in five patients presenting to mental health services, which makes it an important issue for clinicians to consider when assessing current and future risks and vulnerabilities.