Prevalence of criminal offending by men and women with intellectual disability and the characteristics of offenders: implications for research and service development

Association of intellectual disability with violent and sexual crime and victimization: a population-based cohort study

BACKGROUND

Intellectual disability (ID) is associated with violent and sexual offending and victimization, but the importance of neuropsychiatric comorbidity and severity of disability remains unclear.

METHODS

In a register-based cohort study of people born in Sweden 1980-1991 (n = 1 232 564), we investigated associations of mild and moderate/severe ID with any, violent and sexual crimes, and with assault victimization, stratified by comorbid autism and attention deficit hyperactivity disorder (ADHD). We defined ID by attendance at a special school or registered diagnosis and obtained data on criminal convictions and injuries or deaths due to assaults from nationwide registers until end of 2013.

RESULTS

Compared to people without ID, autism or ADHD, men and women with mild or moderate/severe ID and comorbid ADHD had elevated risks of violent crimes [range of hazard ratios (HRs) 4.4-10.4] and assault victimization (HRs 2.0-7.7). Women with mild ID without comorbidities or with comorbid autism also had elevated risks of violent crimes and victimization (HRs 1.8-4.6) compared to women without ID, autism or ADHD. The relative risks of sexual offending and victimization were elevated in men and women with ID without comorbidities (HRs 2.6-12.7). The highest risks for sexual offending in men (HRs 9.4-11.0) and for sexual assault victimization in women (HRs 11.0-17.1) related to ID and comorbid ADHD.

CONCLUSIONS

The elevated risk of violent offending and assault victimization in people with ID is largely explained by comorbid ADHD, whereas ID is independently associated with sexual crimes and victimization, even though absolute risks are low.

Criminal recidivism in offenders with and without intellectual disability sentenced to forensic psychiatric care in Sweden-A 17-year follow-up study

BACKGROUND

Offenders with intellectual disability (ID) constitute a distinct subgroup of offenders with mental disorders. Regarding criminal recidivism, it is unclear whether or not offenders with ID in forensic psychiatric settings differ from offenders without ID. Factors associated with criminal recidivism among offenders with ID have been scarcely investigated.

AIM

To investigate the association between ID and criminal recidivism among offenders sentenced to forensic psychiatric care and to explore the impact of clinical, sociodemographic and offense variables.

MATERIALS AND METHODS

We conducted a retrospective cohort study based on Swedish nationwide registers. A total of 3,365 individuals being sentenced to forensic psychiatric care in Sweden in 1997-2013 were followed from the forensic psychiatric assessment until first reconviction, death, emigration, or 31 December 2013, whichever occurred first. Cox regression models compared rates of recidivism in individuals with and without ID. Impact of clinical, sociodemographic, and offense variables on risk of criminal recidivism was presented as hazard ratios (HRs) with 95% confidence intervals (CIs).

RESULTS

Out of 3,365 offenders sentenced to forensic psychiatric care, 259 (7.7%) were diagnosed with ID. During follow-up (0-17 years, median 6 years), one third (n = 1,099) of the study population relapsed into criminality, giving a recidivism rate of 50.5 per 1,000 person-years. We observed an association between ID and a decreased risk of recidivism (HR 0.8, 95% CI 0.6-1.0, p = 0.063), although this reached statistical significance only for the subgroup of male offenders (HR 0.8, 95% CI 0.6-1.0, p = 0.040) and not females (HR 1.0, 95% CI 0.6-1.8). ID offenders with concurrent ADHD tended to have a higher rate of recidivism (73.9 per 1,000 person-years, HR 1.2, 95% CI 0.6-2.4) than ID offenders without ADHD (42.5 per 1,000 person-years, HR 0.8, 95% CI 0.6-1.1). Amongst ID offenders, concurrent autism spectrum disorder, young age or male sex were not associated with recidivism, while previous criminal convictions were strongly associated with recidivism.

CONCLUSION

A diagnosis of ID was associated with a lower risk of criminal recidivism among male offenders sentenced to forensic psychiatric care. The association between ADHD and recidivism among ID offenders highlights eligible focus areas in the management of offenders with ID.

The impact of the COVID-19 pandemic on the health of adults with intellectual impairment: evidence from two longitudinal UK surveys

BACKGROUND

People with an intellectual impairment experience high levels of social and health inequalities. We investigated the impact of COVID-19 on the physical and mental health of people with intellectual impairment, controlling for demographic risk, socio-economic circumstances and pre-pandemic health levels.

METHOD

Data were drawn from two UK birth cohorts that surveyed their participants on the impact of COVID-19 in May 2020: the Millennium Cohort Study (20-year-old participants) and the British Cohort Survey (50-year-old participants). Health outcomes (COVID-19 infection, COVID-19 symptoms, self-reported physical health, mental health, health service use and impact on health behaviours) were compared between people with and without intellectual impairment, adjusting for gender and ethnicity. Differences were further adjusted for self-reported health pre-pandemic and the impact of COVID-19 on socio-economic circumstances.

RESULTS

Controlling for gender and ethnicity, poor health was reported less often by younger adults [relative risks (RR): 0.44 95% confidence interval (CI) 0.23, 0.86] and more often by older adults (RR: 1.99 95% CI 1.45, 2.73) with intellectual impairment compared with peers. Older adults were also more likely to experience fever and loss of taste/smell. Adjusting for pre-pandemic health and socio-economic circumstances eliminated some differences in the older cohort, but not in the younger one.

CONCLUSION

In young adulthood, the impact of COVID-19 on health outcomes was not negative. The pattern was reversed in later adulthood, although differences were mostly eliminated after adjustment suggesting a socio-economic and age gradient of COVID-19 impacts on intellectual impairment.

Using linked administrative data to determine the prevalence of intellectual disability in adult prison in New South Wales, Australia

BACKGROUND

Studies of the representation of people with intellectual disability (ID) in custody report widely inconsistent findings that reflect variation in how ID is defined and the methods employed for identification. Using linked administrative data may be of utility in studies of the representation of people with ID in custody. However, this approach requires an understanding of the purpose of and factors influencing identification in disparate administrative datasets.

METHODS

This study uses linked administrative data encompassing disability, health and corrections data for the year 2014 to estimate the prevalence of ID in adult custody and explore how ID representation within administrative data impacts prevalence estimates and what patterns of identification reveal about support service access for this group.

RESULTS

This study finds that 4.3% of the New South Wales adult custody population had an identified ID. Prisoners with ID were younger, more likely to have had a previous custodial episode and more likely to be Indigenous than the general prison population. Identification of ID across linked administrative datasets is uneven, which, if used in isolation, would result in variation in prevalence estimates according to source data.

CONCLUSIONS

The utilisation of linkage data from a broad range of health and support services including custody offers a comprehensive identification methodology. Inconsistency in the identification of ID across datasets indicates a potential disjuncture between prisoners with ID and support services, which may have relevance for efforts to reduce reincarceration of those in this population.

Neuroanatomy of complex social emotion dysregulation in adolescent offenders

Social emotions require the correct integration of emotional, cognitive, and social processes and are critical for complex social interactions. Adolescent criminal offenders (AOs) show abnormalities in the experience of basic emotions. However, most research has focused solely on basic emotions, neglecting complex social emotions that could be critical for social reintegration. The purpose of this study was to investigate the behavioral and neural correlates of social emotions (envy and Schadenfreude) in AOs. We explored the experience of complex social emotions, as well as their anatomical correlates, in AOs (n = 19) and a nonoffenders control group (NOs, n = 20). Additionally, we assessed the relationship between social emotions, executive functions (EFs), and fluid intelligence (FI). Structural brain imaging was obtained in all participants. The results showed that AOs had significantly lower envy and Schadenfreude ratings and exhibited lower performance in EFs compared with NOs. The measurement of EFs relied on the INECO frontal screening (IFS). Experiencing fewer social emotions was associated with diminished EFs but not with FI. Moreover, in AOs, reduced levels of envy and Schadenfreude were linked with reduced gray matter volumes in regions subserving mentalizing abilities (inferior parietal lobe and precuneus) and socioemotional processing (inferior and middle temporal regions), as well as key hubs of the executive frontoparietal network (inferior parietal lobule, orbital and rectus gyri). Additional analysis on the AOs revealed no associations between the type of crime and our variables of interest (EFs, FI and social emotions). Our findings are the first to provide evidence on abnormalities in the experience of social emotions in AOs that are associated with neurocognitive markers of social cognition and EFs. Understanding social emotions and their abnormalities (under-experience) as complex intertwined processes may have important future translational implications, including risk prediction for social adaptation/reintegration, sociocognitive targeted interventions, and skill training for social emotions in vulnerable populations.

Screening for intellectual disability in Dutch psychiatrically disturbed detainees: Assessing the psychometric properties of the Screener for Intelligence and Learning Disability (SCIL)

INTRODUCTION

Intellectual disability is a key subject in all mental healthcare institutions, including the forensic mental health services. The Screener for Intelligence and Learning Disability (SCIL) is designed to screen for intellectual disability in forensic populations. So far, this assessment method is only validated in "detention fit prisoners" with low need of care. The aim of the present study was to investigate the psychometric properties of the SCIL in a population of mentally ill detainees with high need of care.

MATERIALS AND METHODS

Screener for Intelligence and Learning Disability scores, mental health reports including intelligence assessment, and criminal records of detainees were obtained. Reliability and validity of the SCIL were calculated, using the Wechsler Adult Intelligence Scale-Fourth Edition (WAIS-IV) and prior studies of the SCIL as a reference.

RESULTS

Cronbach's alpha coefficient for the total SCIL was 0.72. The area under the receiver operating characteristics (ROC) curve was 0.84. Different cut-off values than the original were determined when achieving the optimum in true positives and negatives. The mean intelligence quotient (IQ) score of the study population was 82.6, and 60.3% could be classified with an IQ < 85.

DISCUSSION

The SCIL gives a quick and accurate indication of whether a person is at risk for intellectual disabilities. Although both the reliability and validity of the SCIL are lower in the study population than in regular prison populations, for application of the SCIL in mentally ill detainees all psychometric properties could be classified as acceptable. When assessing the latter populations, it is recommended to use a cut-off value of 20.5 instead of the original 19.5. Additionally, it is advised to revise item 4. Finally, it is important to mention that the estimated prevalence of intellectual disability is the forensic population seems to be larger than expected.

Intellectual disability rates among male prison inmates

While only a small percentage of people with intellectual disabilities are responsible for criminal behaviors, the literature points to their overrepresentation in prisons, although not enough attention has been paid to intellectual disability data for inmates. We retrieved studies - in English, Spanish, Italian or French and indexed in Medline between 2000 and 2018 - that provided intellectual disability data for prisons collected by the administration of validated tests to male inmates. Identified were 13 studies involving more than 15,000 inmates referring to intellectual disability and borderline intellectual disability. The general findings of our review corroborate the overrepresentation of people with ID in prisons, although prevalence rates range widely, from as low as 1% to as high as 69.9% (p<0.000001), reflecting to differences in methodology, in local, social and cultural factors and in judicial procedures. Published studies clearly underline the overrepresentation of people with intellectual disabilities in prisons, differences between countries, the vulnerabilities of persons with intellectual disabilities and the need for proper assessment and management policies in prisons worldwide.

When Do those "Risk-Taking Adolescents" Take Risks? The Combined Effects of Risk Encouragement by Peers, Mild-to-Borderline Intellectual Disability and Sex

Adolescents with mild to borderline intellectual disability (MBID) show more daily life risk taking than typically developing adolescents. To obtain insight in when these "risk-taking adolescents" especially take risks, we investigated main and interaction effects of (a) MBID, (b) sex, and (c) type of peer influence on risk taking. The Balloon Analogue Risk Task (BART) was used as a proxy of real-life risk taking. 356 adolescents (12-19 years, 51.7% MBID, 63.4% boys) were randomly assigned to one of three BART peer-influence conditions: solo (no peers), positive risk encouragement (e.g., 'You are cool if you continue') or negative risk encouragement (e.g., 'You are a softy if you do not continue'). The main finding was that boys with MBID took more risks than typically developing boys in the negative risk encouragement condition. Boys with MBID also took more risks in the negative risk encouragement condition compared to the solo condition, whereas typically developing boys did not. There were no such effects for girls. Surprisingly, boys with MBID took less risks in the solo condition than typically developing boys. We conclude that boys with MBID especially show high risk taking when peers belittle or threat with exclusion from the peer group. Prevention and intervention programs should specifically target boys with MBID to teach them to resist negative risk encouragement by peers.

A qualitative inquiry on recovery needs and resources of individuals with intellectual disabilities labelled not criminally responsible

BACKGROUND

Recovery is a widely accepted paradigm in mental health care, whilst the correctional and forensic-psychiatric field is still searching for foundations for its implementation. Knowledge regarding recovery of persons with intellectual disabilities in secure contexts is limited. This study assesses recovery needs and resources among persons with intellectual disabilities labelled not criminally responsible and investigates the impact of the judicial label on recovery processes.

METHODS

A sample of 26 individuals was composed purposively, and in-depth interviews were conducted. Recurrent themes were identified using thematic analysis.

RESULTS

Traditional recovery themes emerged from the narratives, next to aspects of recovery in a forensic or correctional context. However, the operationalization and proportional impact are specific for this sample.

CONCLUSIONS

The social dimension overarches all other recovery dimensions. The integration of an explicit social rhetoric is imperative, including contextual, relational, interactional and societal dimensions. This offers pathways to reverse the traditional, paternalistic model of exclusion and classification.

Crime and victimization among people with intellectual disability with and without comorbid mental illness

BACKGROUND

Accumulating evidence internationally points to an increased risk of crime perpetration and victimization among people with an intellectual disability (ID). This study aimed to examine the impact that comorbid mental illness had on the association between intellectual disability, crime perpetration and criminal victimization.

METHOD

A case linkage methodology involving 2,220 individuals with an intellectual disability from an Australian State.

RESULTS

One in four (27%) had contacts with public mental health services; 8.2% had a comorbid mental illness. This "dual disability" group was between 2.97 and 3.22 times more likely than those with intellectual disability alone to have a history of criminal charges, and between 2.76 and 2.97 times more likely to have been a victim of crime.

CONCLUSIONS

The extent of criminality and victimization found among people with dual disability indicates a potentially multiply stigmatized group for whom the need for a coordinated cross-agency service response remains paramount.

Peer-Influence on Risk-Taking in Male Adolescents with Mild to Borderline Intellectual Disabilities and/or Behavior Disorders

This study aimed to disentangle the effects of Mild-to-Borderline Intellectual Disability (MBID) and Behavior Disorders (BD)on risk taking in circumstances where peer influence was absent or present. We studied 319 adolescents in four groups: MBID-only, MBID+BD, BD-only, and typically developing controls. The Balloon Analogue Risk-Task (BART), in a solo or peer condition, was used as a proxy of real-life risk-taking. Results show a significant main effect of BART condition. Post-hoc tests indicated higher risk-taking in the peer compared to the solo condition in all groups except BD-only. Moreover, risk taking was increased in adolescents with MBID compared to adolescents without MBID, but only under peer-influence. No main or interaction effects with BD were observed. Model based decomposition of BART performance in underlying processes showed that the MBID related increase in risk-taking under peer-influence was mainly related to increased risk-taking propensity, and in the MBID-only group also to increased safety estimates and increased confidence in these safety estimates. The present study shows that risk-taking in MBID may be better explained by low intellectual functioning than by comorbid BD, and may not originate in increased risk taking per se, but may rather be related to risk-taking under peer-influence, which is a complex, multifaceted risk-taking context. Therefore, interventions to decrease risk-taking by adolescents with MBID that specifically target peer-influence may be successful.

Intelligence Assessment Instruments in Adult Prison Populations: A Systematic Review

Detection of intellectual disability (ID) in the penitentiary system is important for the following reasons: (a) to provide assistance to people with ID in understanding their legal rights and court proceedings; (b) to facilitate rehabilitation programs tailored to ID patients, which improves the enhancement of their quality of life and reduces their risk of reoffending; and (c) to provide a reliable estimate of the risk of offence recidivism. It requires a short assessment instrument that provides a reliable estimation of a person's intellectual functioning at the earliest possible stage of this process. The aim of this systematic review is (a) to provide an overview of recent short assessment instruments that provide a full-scale IQ score in adult prison populations and (b) to achieve a quality measurement of the validation studies regarding these instruments to determine which tests are most feasible in this target population. The Preferred Reporting Items for Systematic reviews and Meta-Analyses Statement is used to ensure reliability. The Satz-Mögel, an item-reduction short form of the Wechsler Adult Intelligence Scale, shows the highest correlation with the golden standard and is described to be most reliable. Nevertheless, when it comes to applicability in prison populations, the shorter and less verbal Quick Test can be preferred over others. Without affecting these conclusions, major limitations emerge from the present systematic review, which give rise to several important recommendations for further research.

Severity of cognitive disability and mental health court determinations about fitness to stand trial

BACKGROUND

Little is known about the socio-demographic, clinical and legal determinants of mental health court decisions of unsoundness of mind and unfitness to stand trial for people with cognitive disability. We aimed to estimate the association between severity of cognitive disability and mental health court determinations of unsoundness or unfitness and describe the socio-demographic, clinical and legal factors that predict these determinations.

METHODS

Case file data were extracted on 92 individuals who had a criminal case referred to the Queensland Mental Health Court between 1 January 2013 and 31 December 2014 due to cognitive disability. We fit a modified multivariable Poisson regression model to estimate the association between severity of cognitive impairment and mental health court determination, controlling for socio-demographic, clinical and legal factors.

RESULTS

Adjusting for covariate effects, severity of cognitive impairment was positively associated with being found unfit to stand trial (adjusted prevalence risk ratio = 1.57; 95% confidence interval: 1.07, 2.33; P = 0.023), and comorbid psychotic disorder predicted an increased risk of being found unsound of mind at the time of offence (adjusted prevalence risk ratio = 3.63; 95% confidence interval: 1.38, 9.54; P = 0.009) by the Queensland Mental Health Court.

CONCLUSIONS

Severity of cognitive disability is associated with determinations of unfitness but does not predict determinations of unsoundness in the Queensland Mental Health Court. Psychiatric assessments of cognitive impairment play a pivotal role in mental health court determinations for people with cognitive disability.

In-patient services for people with intellectual disability and mental health or behavioural difficulties

Over the past few decades, care for people with intellectual disability in the UK has moved from long-stay hospitals to the community. As in the general population, a number of these people have mental health and behavioural difficulties for which they may require in-patient services. Consequently, psychiatrists need to be aware of the in-patient mental healthcare provision for these individuals. This article describes the different categories of in-patient bed for patients with intellectual disability and ways to monitor the quality and outcomes of in-patient care.

Intellectual disability and patient activation after release from prison: a prospective cohort study

BACKGROUND

Intellectual disability and patient activation may be important drivers of inequities in health service access and health outcomes for people with intellectual disability transitioning from prison to the community. We assessed the association between intellectual disability and patient activation after prison release and examined whether this association varied, depending on whether intellectual disability was identified prior to prison release.

METHODS

Overall, 936 prisoners were screened for intellectual disability by using the Hayes Ability Screening Index and completed the Patient Activation Measure (PAM) within 6 weeks of prison release and again at 1, 3 and 6 months post-release. We estimated the association between intellectual disability status and PAM scores by using a multilevel linear model, adjusting for sociodemographic, behavioural, health and criminogenic factors. We used propensity score matching to estimate the impact of being identified with intellectual disability prior to release from prison on the change in mean PAM score after prison release.

RESULTS

Compared with those who screened negative for intellectual disability, ex-prisoners who screened positive, both with and without prior identification of intellectual disability, had significantly decreased mean PAM scores [(B = -4.3; 95% CI: -6.3, -2.4) and (B = -4.5; 95% CI: -6.8, -2.3), respectively] over 6 months of follow-up. Among those who reported being identified with intellectual disability prior to release from prison, a significant increase in PAM score at the 6-month follow-up interview (B = 5.89; 95% CI: 2.35, 9.42; P = 0.001) was attributable to being identified with intellectual disability prior to release.

CONCLUSIONS

Ex-prisoners screening positive for possible intellectual disability have decreased patient activation for at least 6 months after release from prison. However, individuals whose possible intellectual disability is unidentified appear to be particularly vulnerable. Incarceration is a pivotal opportunity for the identification of intellectual disability and for initiating transitional linkages to health and intellectual disability-specific community services for this marginalised population.

Disconnected lives: Women with intellectual disabilities in conflict with the law

BACKGROUND

Women with intellectual/developmental disabilities in conflict with the law experience childhood trauma, substance abuse and intimate partner violence but continue to have difficulty accessing appropriate therapeutic services, both within correctional settings and upon discharge. The aim of this study is to explore women's service needs and to critically assess whether the available services are meeting their identified needs.

METHOD

Semi-structured interviews were conducted with 16 women with intellectual/developmental disabilities who were in the Special Needs Unit of a women's correctional centre from December 2014 to March 2015.

RESULTS

Women with intellectual/developmental disabilities struggle to manage the impact of intergenerational trauma, exacerbated by issues of substance abuse and addiction, poor coping skills and minimal education, all of which impact their sense of well-being.

CONCLUSIONS

This study highlights the need for increasing trauma treatment for women with intellectual/developmental disabilities, and emphasizes the need for accessible intervention to facilitate coping, trauma processing and community integration.

Estimating the risk of crime and victimisation in people with intellectual disability: a data-linkage study

PURPOSE

People with intellectual disability (PWID) appear more likely to be victims and perpetrators of crime. However, extant evidence pertaining to these risks is limited by methodological weaknesses and the absence of consistent operational definitions. This research aimed to estimate the prevalence of criminal histories and victimisation using a large, well-defined sample of PWID.

METHODS

A case-linkage study was conducted comprising 2220 PWID registered with disability services in Victoria, Australia, whose personal details were linked with a state-wide police database. Criminal charges and reports of victimisation were compared to a non-disabled community comparison sample (n = 2085).

RESULTS

PWID were at increased risk of having a history of criminal charges, particularly for violent and sexual offences. Although the non-disabled comparison group had a greater risk of criminal victimisation overall, PWID had a greatly increased risk of sexual and violent crime victimisation.

CONCLUSIONS

PWID are at increased risk of victimisation and perpetration of violent and sexual crimes. Risk of sex offending and victimisation is particularly elevated, and signalling the need for specialised interventions to prevent offending and to ensure victims is assisted with access to justice, support, and treatment.

Aboriginal prisoners and cognitive impairment: the impact of dual disadvantage on Social and Emotional Wellbeing

BACKGROUND

Negligible information is available regarding the Social and Emotional Wellbeing (SEWB) needs of Aboriginal Australian individuals in custody with cognitive impairment. This is problematic given that Aboriginal people with cognitive impairment often experience dual disadvantage in the context of the justice system. This study sought to ascertain the relationship between cognitive impairment and mental health/cultural needs (SEWB) Aboriginal and Torres Strait Islander people in custody.

METHOD

A sample of 122 Aboriginal and Torres Strait Islander people were administered a culturally themed semi-structured questionnaire in custodial settings in Victoria, Australia. The questionnaire included measures of cognitive impairment, SEWB and forensic needs. Analyses were performed to determine differences in the presence of SEWB and unmet custodial needs by level of cognitive impairment.

RESULTS

Findings revealed a diminished level of wellbeing for cognitively impaired participants across several factors. Cognitive impairment was associated with poorer coping mechanisms, additional experiences of racism, difficulties handling emotions, discomfort around non-Aboriginal people and reduced access to meaningful activities in custody. All participants regardless of their level of impairment recognised the importance of cultural engagement; however, cognitively impaired participants had greater difficulty accessing/practicing cultural activities.

CONCLUSIONS

Culturally responsive disability assistance should be available at all phases of the justice system for Indigenous people with cognitive impairment to ensure that equitable care is accessible and needs are addressed.

A Systematic Review of Behavioral Health Interventions for Sex Offenders With Intellectual Disabilities

This article reviews evaluation studies of programs designed to treat sex offenders with intellectual and developmental disabilities (IDD) published in peer-reviewed journals between 1994 and 2014. The design of this study is mirrored after PRISMA (Preferred Reporting of Items for Systematic Reviews and Meta-Analyses) recommendations for conducting a systematic literature review. The study design, study setting, characteristics of participants, type of treatment, and intervention procedures comprise areas of focus for evaluating the implementation of treatment programs. Therapeutic outcomes include changes in attitudes consistent with sex offending, victim empathy, sexual knowledge, cognitive distortions, and problem sexual behaviors. Eighteen treatment evaluation studies were identified from the United States, the United Kingdom, Australia, and New Zealand. Cognitive-behavioral treatments were the most commonly delivered treatment modality to sex offenders with IDD. Other less common treatments were dialectical behavioral therapy, problem solving therapy, mindfulness, and relapse prevention. No randomized controlled trials were identified. The most common designs were multiple case studies and pre- and post-treatment assessments with no control and repeated measures follow-up. Small sample sizes, no control groups, and wide variation in treatment length and follow-up time complicate the qualitative synthesis of study findings. Short follow-up times introduce the potential for bias in conclusions surrounding treatment efficacy for many of the studies reviewed in this analysis. The overall quality of studies examining treatments for sex offenders with IDD is poor and requires further development before rendering firm conclusions about the effectiveness of interventions for this population.

Cool Decision-Making in Adolescents with Behavior Disorder and/or Mild-to-Borderline Intellectual Disability

Adolescents with Behavior Disorders (BD), Mild-to-Borderline Intellectual Disability (MBID), and with both BD and MBID (BD + MBID) are known to take more risks than normal controls. To examine the processes underlying this increased risk-taking, the present study investigated cool decision-making strategies in 479 adolescents (12–18 years, 55.9 % male) from these four groups. Cool decision-making was assessed with the paper-and-pencil Gambling Machine Task. This task, in combination with advanced latent group analysis, allows for an assessment of decision strategies. Results indicated that adolescents with BD and controls were almost equivalent in their decision-making strategies, whereas adolescents with MBID and adolescents with BD + MBID were characterized by suboptimal decision-making strategies, with only minor differences between these two clinical groups. These findings may have important clinical implications, as they suggest that risk taking in adolescents with MBID and in adolescents with BD + MBID can be (partly) attributed to the strategies that these adolescents use to make their decisions. Interventions may therefore focus on an improvement of these strategies.

Implications for public health research of models and theories of disability: a scoping study and evidence synthesis

Background

Public health interventions that are effective in the general population are often assumed to apply to people with impairments. However, the evidence to support this is limited and hence there is a need for public health research to take a more explicit account of disability and the perspectives of people with impairments.

Objectives

(1) To examine the literature on theories and models of disability; (2) to assess whether or not, and how, intervention studies of effectiveness could incorporate more inclusive approaches that are consistent with these theories and models; and (3) to use the findings to draw out implications for improving evaluative study designs and evidence-based practice.

Review methods

The project is a scoping review of the literature. The first stage examines theories and models of disability and reflects on possible connections between theories of disability and public health paradigms. This discussion is used to develop an ethical–empirical decision aid/checklist, informed by a human rights approach to disability and ecological approaches to public health. We apply this decision aid in the second stage of the review to evaluate the extent to which the 30 generic public health reviews of interventions and the 30 disability-specific public health interventions include the diverse experiences of disability. Five deliberation panels were also organised to further refine the decision aid: one with health-care professionals and four with politically and socially active disabled people.

Results

The evidence from the review indicated that there has been limited public health engagement with theories and models of disability. Outcome measures were often insensitive to the experiences of disability. Even when disabled people were included, studies rarely engaged with their experiences in any meaningful way. More inclusive research should reflect how people live and ‘flourish’ with disability.

Limitations

The scoping review provides a broad appraisal of a particular field. It generates ideas for future practice rather than a definite framework for action.

Conclusions

Our ethical–empirical decision aid offers a critical framework with which to evaluate current research practice. It also offers a resource for promoting more ethical and evidence-based public health research that is methodologically robust while being sensitive to the experiences of disability.

Future work

Developing more inclusive research and interventions that avoid conceptualising disability as either a ‘burden’ or ‘problem’ is an important starting point. This includes exploring ways of refining and validating current common outcome measures to ensure that they capture a diverse range of disabling experiences, as well as generating evidence on meaningful ways of engaging a broad range of disabled children and adults in the research process.

Funding

The National Institute for Health Research Public Health Research programme.

Crime and victimisation in people with intellectual disability: a case linkage study

BACKGROUND

Studies have suggested that people with intellectual disability are disproportionately involved in crime both as perpetrators and victims.

METHOD

A case linkage design used three Australian contact-level databases, from disability services, public mental health services and police records. Rates of contact, and official records of victimisation and criminal charges were compared to those in a community sample without intellectual disability.

RESULTS

Although people with intellectual disability were significantly less likely to have an official record of victimisation and offending overall, their rates of violent and sexual victimisation and offending were significantly higher. The presence of comorbid mental illness considerably increased the likelihood of victimisation and offending; several sex differences were also noted.

CONCLUSIONS

People with intellectual disability are at increased risk for both violent and sexual victimisation and offending. The presence of comorbid mental illness aggravates the risk of offending and victimisation. Future research should focus on a more nuanced exploration of the risks associated with intellectual disability and specific mental disorders and related indices of complexity.

Intellectual Disabilities Among Prisoners: Prevalence and Mental and Physical Health Comorbidities

BACKGROUND

Limited evidence suggests that people with ID (ID) are overrepresented in prisons although prevalence rates of ID among prisoners vary significantly across studies, making it difficult to identify prevalence and assess existing need.

METHOD

A systematic review of relevant literature was conducted, and results were organized and compared in relation to study aims, design, measures used to screen for ID, sample, limitations and key findings.

RESULTS

Existing international data suggest a prevalence of prisoners with ID between 7 and 10%. Most frequent coexisting health issues among this population are hearing and vision impairments, obesity, diabetes and a range of mental health disorders, notably anxiety and personality and conduct disorders.

CONCLUSION

More research is required on prevalence rates and associated comorbidities of ID within prison settings, taking into account the heterogeneity of the population with ID.

Crime and Legal Issues among Intellectually Disabled Individuals

Intellectual Disability (ID) can be caused by a variety of factors, which may lead to a variety of signs and symptoms. Individuals with ID are living in societies where during the past decade there is a steady increase in the amount of research focused on civil law, criminal law and mental health. In this chapter, there will be a theoretical presentation of the research on ID regarding criminal law and the different forms of aggressive behavior such as sexual violence, homicide, theft, arson and alcohol-drug abuse. There will be information on research regarding civil law and the most common problems for individuals with ID, such as financial capacity and capacity for medical consent. Finally, there will be a section for the most important issues regarding the trial and conviction for individuals with ID and a presentation of a recent research on attitudes toward ID and legal issues. The above will be examined through the prism of current neuropsychological data, while cross-cultural restrictions will be discussed.

A national survey of offending behaviour amongst intellectually disabled users of mental health services in Ireland

BACKGROUND

Offenders with an intellectual disability pose a major challenge to Intellectual Disability Service providers in the Republic of Ireland. This is especially so as no national Forensic Intellectual Disability Service currently exists. The Forensic Intellectual Disability Working Group of the Irish College of Psychiatrists was established in order to take steps to address this issue by establishing the level of need for a Forensic Intellectual Disability Service in Ireland and developing a college position paper. No previous study has been carried out to measure offending behaviour amongst persons with an intellectual disability attending mental health services in Ireland.

METHODS

A postal survey was undertaken targeting the lead clinicians of all Intellectual Disability Psychiatry, General Adult Psychiatry and Forensic Psychiatry Services in the Republic of Ireland. This survey requested anonymous data regarding service users with an intellectual disability and offending behaviour in this population.

RESULTS

Data relating to 431 service users was returned. Those reported to engage in offending behaviour were predominantly young males. Assault was the most common offence type. A significant number of serious offences such as unlawful killing, sexual assault and arson were reported.

CONCLUSIONS

There is an urgent need for the development of a Forensic Intellectual Disability Service in the Republic of Ireland. The current efforts of the National Forensic Mental Health Service to establish such a service by the creation of a post of Consultant Forensic Psychiatrist (special interest in intellectual disability) are to be welcomed.

Prospective cohort study of the relationship between neuro-cognition, social cognition and violence in forensic patients with schizophrenia and schizoaffective disorder

BACKGROUND

There is a broad literature suggesting that cognitive difficulties are associated with violence across a variety of groups. Although neurocognitive and social cognitive deficits are core features of schizophrenia, evidence of a relationship between cognitive impairments and violence within this patient population has been mixed.

METHODS

We prospectively examined whether neurocognition and social cognition predicted inpatient violence amongst patients with schizophrenia and schizoaffective disorder (n = 89; 10 violent) over a 12 month period. Neurocognition and social cognition were assessed using the MATRICS Consensus Cognitive Battery (MCCB).

RESULTS

Using multivariate analysis neurocognition and social cognition variables could account for 34 % of the variance in violent incidents after controlling for age and gender. Scores on a social cognitive reasoning task (MSCEIT) were significantly lower for the violent compared to nonviolent group and produced the largest effect size. Mediation analysis showed that the relationship between neurocognition and violence was completely mediated by each of the following variables independently: social cognition (MSCEIT), symptoms (PANSS Total Score), social functioning (SOFAS) and violence proneness (HCR-20 Total Score). There was no evidence of a serial pathway between neurocognition and multiple mediators and violence, and only social cognition and violence proneness operated in parallel as significant mediators accounting for 46 % of the variance in violent incidents. There was also no evidence that neurocogniton mediated the relationship between any of these variables and violence.

CONCLUSIONS

Of all the predictors examined, neurocognition was the only variable whose effects on violence consistently showed evidence of mediation. Neurocognition operates as a distal risk factor mediated through more proximal factors. Social cognition in contrast has a direct effect on violence independent of neurocognition, violence proneness and symptom severity. The neurocognitive impairment experienced by patients with schizophrenia spectrum disorders may create the foundation for the emergence of a range of risk factors for violence including deficits in social reasoning, symptoms, social functioning, and HCR-20 risk items, which in turn are causally related to violence.

Recognising, assessing and managing offending behaviour in persons with intellectual disability

The association between intellectual disability and offending is complex. Recent evidence would suggest that the received wisdom of intellectually disabled persons being more prone to offending is either incorrect or only tells part of the story. Those within the ‘borderline’ intellectual disability range may be more prone to committing sexual and criminal damage offences but those with an IQ less than 50 rarely offend.

The offender with intellectual disability shares characteristics with his counterpart from the general population. As with the general population as a whole, offending in this group is often unreported and its recognition is complicated by issues of competence. The lack of validated forensic assessment schedules for this population poses a further challenge. Some general approaches to assessment in this population are discussed. This case report illustrates the difficulties of assessing and managing offending behaviour in an individual with moderate intellectual disability. The challenge of treating offenders with an intellectual disability is immense and requires specialist expertise. Managing such cases in a generic setting is inappropriate and the need for a forensic learning disability service in Ireland is highlighted.

Physical health outcomes in prisoners with intellectual disability: a cross-sectional study

BACKGROUND

People with intellectual disability (ID) in the general population and people in prison experience unrecognised medical conditions and inadequate disease prevention. Among prisoners, those with an ID may be particularly disadvantaged. The aim of this study was to identify demographic, health and health-related characteristics of adult prisoners who screened positive for ID.

METHODS

Cross-sectional data were collected via face-to-face administration of a structured questionnaire in seven prisons in Queensland, Australia, between 2008 and 2010. Participants were adult prisoners within 6 weeks of release from custody. We identified ID using a pragmatic screening tool. Prisoners who scored <85 on the Hayes Ability Screening Index and either (a) reported having attended a special school or (b) reported having been diagnosed with an ID were considered to have screened positive for ID. We compared the characteristics of participants who screened positive and negative for ID using univariable and multivariable logistic regression.

RESULTS

Screening positive for ID was associated with younger age, identifying as Indigenous and lower educational achievement. Prisoners who screened positive for ID were more likely to have been diagnosed with medical conditions such as heart disease (odds ratio; 95% confidence interval = 2.1; 1.0-4.2) and hearing problems (2.2; 1.3-3.7), after adjustment for age, sex, education level and Indigenous status. Screen-positive prisoners were less likely to have received preventive care interventions such as testing for hepatitis A infection (0.4; 0.2-0.6), and immunisation for tuberculosis (0.4; 0.2-0.8). Prisoners with possible ID were more likely to be obese (1.7; 1.1-2.7).

CONCLUSIONS

Adult prisoners who screen positive for ID have worse health outcomes than their non-disabled peers. An improved understanding of physical health characteristics prior to release can direct treatment and support pathways out of the criminal justice system and inform transitional planning of health services for this profoundly disadvantaged group.

The effectiveness of police custody assessments in identifying suspects with intellectual disabilities and attention deficit hyperactivity disorder

BACKGROUND

Intellectual Disabilities (ID) and Attention Deficit Hyperactivity Disorder (ADHD) are recognized psychological vulnerabilities in police interviews and court proceedings in England and Wales. The aims of this study were to investigate: (a) the prevalence of ID and/or ADHD among suspects detained at a large London metropolitan police station and their relationship with conduct disorder (CD), (b) the impact of their condition on police staff resources, (c) the effectiveness of current custody assessment tools in identifying psychological vulnerabilities, and (d) the use of 'Appropriate Adults' in interviews.

METHOD

A total of 200 individuals in a police custody suite were interviewed and screened for ID, ADHD (current symptoms) and CD.

RESULTS

The screening rates for these three disorders were 6.7%, 23.5% and 76.3%, respectively. ADHD contributed significantly to increased requests being made of staff after controlling for CD and duration of time in custody. This is a novel finding. Reading and writing difficulties and mental health problems were often identified from the custody risk assessment tools, but they were not used effectively to inform on the need for the use of an Appropriate Adult. The frequency with which Appropriate Adults were provided to support detainees in police interviews (4.2%) remains almost identical to that found in a similar study conducted 20 years previously.

CONCLUSIONS

The current findings suggest that in spite of reforms recently made in custodial settings, procedures may not have had the anticipated impact of improving safeguards for vulnerable suspects. Detainees with ID and ADHD require an Appropriate Adult during police interviews and other formal custody procedures, which they commonly do not currently receive. The findings of the current study suggest this may be due, in large part, to the ineffective use of risk-assessment tools and healthcare professionals, which represent missed opportunities to identify such vulnerabilities.

Prevalence of disabled people involved in Spanish Civil Guard's police activity

Improving interventions with victims and offenders with disabilities requires analysis of the degree of prevalence of crimes in which these people are involved. For this purpose, data regarding interventions made by the Spanish Civil Guard between 2008 and 2010, in which 2099 people had some kind of disability, have been collected and analyzed, with particular regard to criminal offenses (felonies and/or misdemeanors). In this study, the relationship between the types of disability a person has and other variables like their connection to the incident, their gender, age, the relationship between victim and perpetrator, and the time and place of the events were all taken into consideration. The results show that most of the victims with disabilities served by the Spanish Civil Guard were male. The interventions were mainly aid and rescues. Criminal offenses were only 20% of the events.

Police contact with people with an intellectual disability: the independent third person perspective

BACKGROUND

A number of jurisdictions have instituted legislation requiring an independent person to be present during police interviews with vulnerable people. In Victoria, Australia, a group of volunteers known as independent third persons help to fulfil this role with people who present with cognitive impairment arising from their mental illness or disability. This study sought to explore the perspectives of the Independent Third Person volunteers on police identification of and responses to people with intellectual disability (ID).

METHODS

All registered Independent Third Person volunteers across the State of Victoria in Australia were identified and sent a postal survey on their experiences and confidence in performing their role, their perceptions of police competency, and the challenges they faced working at this interface.

RESULTS

Of the 207 Independent Third Persons identified, 94 (45%) completed and returned the survey. Participants reported that despite being overly reliant on previous police contacts and cues relating to communication difficulties, they viewed police as generally competent in their ability to identify people with ID. They also considered themselves confident in performing their own roles at this interface, albeit more so at the perfunctory aspects of the role and less so with the emotional aspects of supporting the person being interviewed.

CONCLUSIONS

Police are seen as competent at identifying those with cognitive deficits and seeking appropriate supports for the person with ID in the interview context. More specialised training for police members is recommended in communicating with people with IDs. Volunteers working at this interface require additional support and training in helping to meet the emotional needs of those being interviewed.

Resilience and Professional Quality of Life in Staff Working with People with Intellectual Disabilities and Offending Behavior in Community Based and Institutional Settings

Staff in forensic services for people with intellectual disabilities (ID) are expected to deal with a wide range of emotional challenges when providing care. The potential impact of this demanding work has not been systematically explored previously. This article explores the professional quality of life (QoL) and the resilience (hardiness) of the staff in this setting. The Professional QoL questionnaire and the Disposional Resilience Scale were completed by staff (n=85, 80% response rate) in the Norwegian forensic service for ID offenders. Responses from staff working in institutional settings were compared to those from staff in local community services. Staff in the local community services had higher resilience scores compared to the staff in the institutional setting, (t=2.19; P<0.05). However in the other QoL and resilience domains there were no differences between the staff in the two settings. The greater sense of resilient control among community staff may be a function of both the number of service users they work with and the institutional demands they face. Even though these participants worked with relatively high risk clients, they did not report significantly impaired quality of life compared to other occupations.

Differences between juvenile offenders with and without intellectual disability in offense type and risk factors

The present study aimed to examine differences between American juvenile offenders with and without intellectual disability (ID) in offense type and risk factors. The sample consisted of adolescents with ID (n=102) and without ID (n=526) who appeared before the courts for a criminal act and for whom the Washington State Juvenile Court Assessment (WSJCA) was completed. Results showed that adolescents with ID had committed more offenses against persons compared to adolescents without ID. Few differences in risk factors were found between juvenile offenders with and without ID in the domains of school, family and use of free time. Juvenile offenders without ID more often had problems in the relationship and alcohol/drugs domain, whereas juveniles with ID more often experienced problems in the domains of attitude, aggression and skills.

Exploring the reliability and validity of the social-moral awareness test

BACKGROUND

The aim of the study was to explore the validity of the social-moral awareness test (SMAT) a measure designed for assessing socio-moral rule knowledge and reasoning in people with learning disabilities. Comparisons between Theory of Mind and socio-moral reasoning allowed the exploration of construct validity of the tool. Factor structure, reliability and discriminant validity were also assessed.

MATERIALS AND METHODS

Seventy-one participants with mild-moderate learning disabilities completed the two scales of the SMAT and two False Belief Tasks for Theory of Mind.

RESULTS

Reliability of the SMAT was very good, and the scales were shown to be uni-dimensional in factor structure. There was a significant positive relationship between Theory of Mind and both SMAT scales.

CONCLUSIONS

There is early evidence of the construct validity and reliability of the SMAT. Further assessment of the validity of the SMAT will be required.

Defendants with intellectual disabilities and mental health diagnoses: faring in a mental health court

BACKGROUND

Begun in the late 1990s, mental health courts are specialty criminal courts developed to address the needs of persons with mental illness.

METHODS

As many persons with intellectual disabilities (IDs) may overlap in the mental health court system, we used mental health court records to examine the phenomenology and outcomes of 224 defendants with and without co-occurring IDs in the mental health court. This study had two goals: (1) to examine the prevalence of defendants with IDs in the court and (2) to compare defendants with dual diagnoses with defendants with lone mental health disorders.

RESULTS

Approximately 11% of defendants in the mental health court also had IDs. Compared with individuals with mental health disorders alone, individuals with dual diagnoses were more likely to be younger, male, African-American and less well-educated; these defendants were also more likely to show externalising, 'turning-against-others' symptoms, less likely to show internalising, 'turning-against-self' symptoms. Defendants with IDs (vs. those without) more often received behavioural, vocational rehabilitation and other services, although the two groups did not differ on most outcome variables.

CONCLUSION

Directions for future research are discussed.

College students' conceptualizations of deficits involved in mild intellectual disability

Precedential rulings in recent capital murder trials may, in some cases, leave it up to a jury to determine whether or not an individual meets criteria for an intellectual disability (ID) and should be spared from the death penalty. Despite the potential for misconceptions about ID to bias decisions, few empirical studies have examined the public's conceptualizations of individuals with ID. This study sought to examine 890 college students' conceptualizations of the deficits involved in mild ID. Students were asked to respond to two online surveys about the cognitive and adaptive behavior deficits that people with mild ID may experience. While most students were correct about basic facts, such as ID is not contagious and not curable, there was no clear consensus regarding beliefs about individuals with ID getting married, having children, or engaging in other mainstream activities of adult living. Students' responses are examined in light of results of studies that identify and examine bona fide deficits and areas of successful mainstreaming among persons with ID. Implications of misconceptions are discussed.

Moral judgment of young sex offenders with and without intellectual disabilities

This study examined differences in moral judgment between juvenile sex offenders with and without intellectual disabilities. The Sociomoral Reflection Measure-Short Form (SRM-SF) was used to assess moral judgment, and was extended with questions referring to general sexual situations and to the offenders' abuse victim(s). Juvenile sex offenders with and without ID significantly differed in moral judgment stage regarding general life, sexual and own abuse victim situations. Juvenile sex offenders with ID generally showed stage 2 moral reasoning, which indicated that their justifications for moral decisions were dominated by instrumental and pragmatic reciprocity, whereas juvenile sex offenders without ID used reasons and justifications representing transitional moral stage 2/3 moral judgment, indicating that the maintenance of interpersonal relationships was considered to a certain extent in their justifications for moral decisions. Future research should examine to what extent moral judgment of offenders with ID should be targeted in treatment.

The relation of violence exposure and ethnicity to intelligence and verbal-performance discrepancies in incarcerated male adolescents

Incarcerated populations have an estimated incidence of intellectual disabilities (IDs) far higher than national norms, ranging as high as 10%. In the present study, the relation between ID and violence exposure in 115 incarcerated adolescents was examined. Interpersonal violence exposure (IPV-E) predicted an average decrease in full scale IQ of 4.5 points, explaining approximately 5% of the difference in IQ. Child maltreatment increased the odds of having a verbal disability by three folds and explained 17% of the variance in verbal disability. Hierarchical regression was used to examine the relative contribution of ethnicity, poverty, and violence exposure to intellectual functioning. The literature on racial bias in incarceration and the implications for the present study are discussed.

Prevalence of intellectual disabilities in Norway: Domestic variance

Based on national registers, the prevalence of intellectual disability (ID) in Norway is estimated to be 0.44 per 100 inhabitants. This study aimed to examine geographic and urban-rural differences in the prevalence of ID in Norway. Methods A survey based on the national register. Financial transfers intended to provide equal services to people with ID are based on these reports. Results A higher prevalence was found in the North region of Norway. A negative correlation between the population density and the prevalence of ID was also found. Conclusion There was considerable geographic and urban-rural differences in the prevalence of ID, which may be attributable to not only the large diversity of services, but also some other factors. The results were discussed with respect to the deinstitutionalisation progress, resource-intensive services and costs. Differences also reflect some problems in diagnosing ID in people having mild ID.