Cumulative childhood adversity, adolescent psychiatric disorder and violent offending in young adulthood

Homelessness, psychiatric disorders, and violence in Denmark: a population-based cohort study

BACKGROUND

Homelessness is associated with adverse health and social outcomes. People experiencing homelessness have been found to have a high risk of violent crime victimisation as well as high prevalence of psychiatric disorders. It is poorly understood whether experiencing homelessness is associated with additional risks of violent offending and whether psychiatric disorders contribute to these risks. We examined the association between homelessness, psychiatric disorders, and first violence offence leading to conviction.

METHODS

We did a nationwide, register-based cohort study of all Danish residents who were alive at least 1 day during the study period, born between Jan 1, 1980, and Dec 31, 2006, and aged 15 years or older retrieved from the Danish Civil Registration System, which was linked to registers with information on homelessness, health care, and criminality. The exposure was any experience of homelessness, which was defined as having at least one contact with a homeless shelter during the study period. The outcome was first violent offence leading to a conviction. We calculated incidence rates per 10 000 person-years, incidence rate ratios (IRRs) using Poisson regression analysis, and probability of conviction of a violent offence using an Aalen-Johansen estimator. Analyses were stratified by sex and adjusted for calendar year of the study period, age, other sociodemographic factors, and psychiatric disorders.

FINDINGS

The study cohort included 1 786 433 Danish residents aged 15-42 years living in Denmark at some point from Jan 1, 2001, to Dec 31, 2021, contributing to 21 336 322 person-years at risk, of whom 57 084 (3·2%) individuals had their first violent offence leading to conviction during follow-up. 10 years after their first contact with a homeless shelter, 22·9% (95% CI 21·6-24·2) of men and 7·7% (6·8-8·7) of women had committed at least one violent crime leading to conviction. The fully adjusted IRRs of a violent offence leading to conviction were 4·8 (4·5-5·1) in men and 6·3 (5·6-7·2) in women experiencing homelessness compared with individuals who had not experienced homelessness. The IRR for a violent offence leading to conviction was highest in individuals experiencing homelessness and having co-occurring psychiatric disorders compared with those not experiencing homelessness and without co-occurring psychiatric disorders, especially drug use disorders (IRR in those experiencing homelessness and having a drug use disorder: 15·3 [14·1-16·7] in men and 40·1 [33·9-47·5] in women compared with individuals not experiencing homelessness and having no drug use disorder).

INTERPRETATION

Individuals experiencing homelessness had higher risks of a violent offence leading to conviction than those who had not experienced homelessness. In addition to preventing homelessness, public health and policy should consider how to reduce the risk of adverse outcomes in people experiencing homelessness.

FUNDING

Lundbeck Foundation.

Lifelong mental health service use among 15-22 years old offenders: a document-based, mixed-methods descriptive study

OBJECTIVES

Among young offenders, psychiatric morbidity and comorbidity are common, but our knowledge about their use of mental health services during childhood and adolescence is scarce. We aimed to describe the lifelong use of mental health services of young offenders who have committed serious crimes.

DESIGN AND STUDY SETTING

Using data on forensic psychiatric examinations of 42 Finnish offenders aged 15-22 years, we analysed the timing and typical patterns of their prior mental health service use with qualitative and quantitative content analysis and typification.

RESULTS

Young offenders appeared in this study as children with plenty of perinatal and developmental risks, and risks related to their family situation and peer relations. Most subjects were described as having had emotional or behavioural symptoms, or both, since childhood. Involvement in mental health services was rare before the age of 7 years but increased markedly after that, staying on the same level during adolescence. Five categories of mental health service users were identified: (1) continuing service use around a decade (14.3%), (2) one brief fixed treatment (11.9%), (3) involuntary use of services (31.0%), (4) evasive use of services (21.4%) and (5) no mental health service use (21.4%).

CONCLUSIONS

Young offenders had symptoms from early ages, but during childhood and adolescence, involvement in mental health services appeared for most as relatively short, repetitive or lacking. To help children at risk of criminal development, a multiprofessional approach, an early evidence-based intervention for behavioural symptoms and screening for learning problems, traumatic experiences and substance use are necessary. Results can help identify children and adolescents with a risk of criminal development, to develop mental health services and to plan further research.

Cumulative Childhood Adversity and Its Associations With Mental Health in Childhood, Adolescence, and Adulthood in Rural China

Capitalizing on a 15-year longitudinal dataset of 9-12 years old children in rural China, this study adopts a life course perspective and analyzes cumulative childhood adversity and its associations with mental health problems from childhood to adulthood. Four domains of childhood life are selected to construct cumulative childhood adversity: socioeconomic hardship, family disruption, physical issue, and academic setback. Overall, cumulative childhood adversity significantly associates with children's internalizing and externalizing problems as well as adults' depression and self-esteem. However, cumulative childhood adversity has no significant relationship with internalizing and externalizing problems in adolescence. Furthermore, different domains of childhood adversity matter differently for mental health problems in different life stages. Physical issue and academic setback have the strongest association with internalizing and externalizing problems in childhood, while only socioeconomic hardship has a significant relationship with depression and self-esteem in adulthood. The relationship between cumulative childhood adversity and adult mental health problems is fully mediated by educational attainment. Finally, there is no gender difference in either the occurrence of cumulative childhood adversity or the association between cumulative childhood adversity and mental health problems.