A systematic review of cognition in homeless children and adolescents

Exploring and Mapping Screening Tools for Cognitive Impairment and Traumatic Brain Injury in the Homelessness Context: A Scoping Review

Cognitive impairment is common amongst people experiencing homelessness, yet cognitive screening and the collection of history of brain injury rarely features in homelessness service delivery practice. The purpose of this research was to scope and map strategies for screening for the potential presence of cognitive impairment or brain injury amongst people experiencing homelessness and identify instruments that could be administered by homelessness service staff to facilitate referral for formal diagnosis and appropriate support. A search was conducted across five databases, followed by a hand search from relevant systematic reviews. A total of 108 publications were included for analysis. Described in the literature were 151 instruments for measuring cognitive function and 8 instruments screening for history of brain injury. Tools that were described in more than two publications, screening for the potential presence of cognitive impairment or history of brain injury, were included for analysis. Of those regularly described, only three instruments measuring cognitive function and three measuring history of brain injury (all of which focused on traumatic brain injury (TBI)) may be administered by non-specialist assessors. The Trail Making Test (TMT) and the Ohio State University Traumatic Brain Injury Identification Method (OSU TBI-ID) are both potentially viable tools for supporting the identification of a likely cognitive impairment or TBI history in the homelessness service context. Further population-specific research and implementation science research is required to maximise the potential for practice application success.

Homelessness and health-related outcomes: an umbrella review of observational studies and randomized controlled trials

BACKGROUND

Homelessness has been associated with multiple detrimental health outcomes across observational studies. However, relatively few randomized controlled trials (RCTs) have been conducted on people who experience homelessness (PEH). Thus, this umbrella review ranked the credibility of evidence derived from systematic reviews (SRs) and meta-analyses (MAs) of observational studies investigating the associations between homelessness and any health outcome as well as RCTs targeting health needs in this population.

METHODS

Several databases were systematically searched from inception through April 28, 2021. Any SR and/or MA reporting quantitative data and providing a control group were eligible for inclusion. The credibility of the evidence derived from observational studies was appraised by considering the significance level of the association and the largest study, the degree of heterogeneity, the presence of small-study effects as well as excess significance bias. The credibility of evidence was then ranked in five classes. For SRs and/or MAs of RCTs, we considered the level of significance and whether the prediction interval crossed the null. The AMSTAR-2 and AMSTAR-plus instruments were adopted to further assess the methodological quality of SRs and/or MAs. The Newcastle-Ottawa Scale (NOS) was employed to further appraise the methodological quality of prospective cohort studies only; a sensitivity analysis limited to higher quality studies was conducted.

RESULTS

Out of 1549 references, 8 MAs and 2 SRs were included. Among those considering observational studies, 23 unique associations were appraised. Twelve of them were statistically significant at the p≤0.005 level. Included cases had worst health-related outcomes than controls, but only two associations reached a priori-defined criteria for convincing (class I) evidence namely hospitalization due to any cause among PEH diagnosed with HIV infection, and the occurrence of falls within the past year among PEH. According to the AMSTAR-2 instrument, the methodological quality of all included SRs and/or MAs was "critically low." Interventional studies were scant.

CONCLUSION

While homelessness has been repeatedly associated with detrimental health outcomes, only two associations met the criteria for convincing evidence. Furthermore, few RCTs were appraised by SRs and/or MAs. Our umbrella review also highlights the need to standardize definitions of homelessness to be incorporated by forthcoming studies to improve the external validity of the findings in this vulnerable population.

Psychological, social and cognitive resources and the mental wellbeing of the poor

Our study takes advantage of unique data to quantify deficits in the psychosocial and cognitive resources of an extremely vulnerable subpopulation–those experiencing housing vulnerability–in an advanced, high-income country (Australia). Groups such as these are often impossible to study using nationally representative data sources because they make up a small share of the overall population. We show that those experiencing housing vulnerability sleep less well, have more limited cognitive functioning, and less social capital than do those in the general population. They are also less emotionally stable, less conscientious, more external, and more risk tolerant. Collectively, these deficits in psychosocial and cognitive resources account for between 24–42% of their reduced life satisfaction and their increased mental distress and loneliness. These traits also account for a large proportion of the gap in mental wellbeing across different levels of housing vulnerability.

What about the babies? A critical review of infants' and toddlers' absence in homelessness scholarship

Rates of family homelessness continue to reach unprecedented levels. As many as two million young children experience family homelessness each year, with an estimated one in 10 younger than one year old. Yet, despite their high prevalence, a dearth of studies have specifically investigated infants' and toddlers' experiences of homelessness. Overall, the available literature suggests homeless infants and toddlers experience increased risk to physical health, development, and well-being at an individual- and family-level. This presents a severely limited understanding of homeless infants' and toddlers' experiences, with substantial gaps remaining. This review documents the scant existing literature on infant and toddler development within the context of homelessness at both the individual and family-system levels, and proposes next steps for research, practice, and policy.

The psychological impact of childhood homelessness-a literature review

In August 2019, 3848 children in Ireland were faced with emergency homelessness [1]. In recent years, lack of affordable housing, unemployment and shortage of rental properties have been the primary driving factors for the potentially devastating impact of familial homelessness in our society [1]. Our aim was to evaluate current knowledge on the psychological impact of homelessness in children. Using the PRISMA model, we performed a review of the currently available literature on the psychological impact of homelessness on children. This concept was explored under two different categories-'transgenerational' and 'new-onset homelessness'. Hidden homelessness was also explored. Our literature review revealed several psychological morbidities which were unique to children. This includes developmental and learning delays, behavioural difficulties and increased levels of anxiety and depression [66, 77, 40, 81, 42]. This has been demonstrated by poorer performance in school testing and increased levels of aggression. Anxiety in children within this cohort has been shown to peak at time of dispersion from their stable home environment [67]. Our study highlights violence, aggression and poor academic learning outcomes to be just some of the key findings in our review of homelessness in childhood, worldwide. Unfortunately, there has been minimum research to date on paediatric homelessness within the context of the Irish population. We anticipate this review to be the first chapter in a multipart series investigation to evaluate the psychological morbidity of paediatric homelessness within the Irish Society.

Trauma, Family Factors and the Mental Health of Homeless Adolescents

Family factors, such as poor family functioning and trauma, have been associated with negative outcomes for homeless adolescents. Further study is needed to better understand how family factors and trauma jointly relate to mental health problems and externalizing behaviors among homeless adolescents. Structural equation modeling was used to examine the influence of trauma (encompassing traumatic events experienced prior to, and after, becoming homeless) and family factors (poor family functioning and family conflict) on mental health problems and externalizing behaviors (substance use, delinquent behaviors, and sexual risk) among 201 homeless adolescents, ages 12 to 17 years. Trauma, poor family functioning, and family conflict significantly predicted greater mental health problems, delinquent behaviors, high-risk sexual behaviors and substance use. Overall, the findings suggest that family factors appear to be key to understanding mental health problems and externalizing behaviors among homeless adolescents. Implications, limitations and future directions are addressed.

Cognitive Skills Training for Homeless Transition-Age Youth: Feasibility and Pilot Efficacy of a Community Based Randomized Controlled Trial

Cognitive impairments are common in homeless youth and negatively impact academic and vocational outcomes. We examined the feasibility and efficacy of cognitive interventions provided to 18- to 22-year-old homeless youth living in urban supportive housing. Ninety-one homeless youth were randomized to receive either targeted cognitive training (cognitive remediation) or general cognitive activation (computer skills training). Cognitive and psychological outcomes were assessed at baseline, after 13 and 26 sessions, and 1 month postintervention. A high dropout rate highlighted the feasibility challenges of treating this population. Intent-to-treat analysis found significant improvements across groups in specific and global measures of cognition and psychological distress, with no significant group differences. Transition-age homeless youth show improvements in cognitive and psychological functioning when engaged in interventions that address their cognitive development. This speaks to the malleability of cognitive skills in this cohort and lays the groundwork for future research to address their cognitive health.

Adverse outcomes among homeless adolescents and young adults who report a history of traumatic brain injury

OBJECTIVES

We examined the prevalence of self-reported traumatic brain injury (TBI) among homeless young people and explored whether sociodemographic characteristics, mental health diagnoses, substance use, exposure to violence, or difficulties with activities of daily living (ADLs) were associated with TBI.

METHODS

We analyzed data from the Wilder Homelessness Study, in which participants were recruited in 2006 and 2009 from streets, shelters, and locations in Minnesota that provide services to homeless individuals. Participants completed 30-minute interviews to collect information about history of TBI, homelessness, health status, exposure to violence (e.g., childhood abuse, assault), and other aspects of functioning.

RESULTS

Of the 2732 participating adolescents and young adults, 43% reported a history of TBI. Participants with TBI became homeless at a younger age and were more likely to report mental health diagnoses, substance use, suicidality, victimization, and difficulties with ADLs. The majority of participants (51%) reported sustaining their first injury prior to becoming homeless or at the same age of their first homeless episode (10%).

CONCLUSIONS

TBI occurs frequently among homeless young people and is a marker of adverse outcomes such as mental health difficulties, suicidal behavior, substance use, and victimization.

Cognitive deficit and mental health in homeless transition-age youth

BACKGROUND AND OBJECTIVES

There is increasing recognition of the cognitive consequences of socioeconomic adversity during childhood, which can impair learning and negatively affect social and emotional development. However, there is a paucity of research on cognitive functioning and mental health among transition-age homeless youth. This study aimed to address this knowledge gap by examining the prevalence and functional significance of cognitive impairment and mental health disorders in a sample of 18- to 22-year-old homeless youth.

METHODS

Participants (N = 73) were recruited from a vocational support program at Covenant House New York, a care agency for homeless youth. Assessments included diagnostic assessment for mental health disorders and evaluation of neurocognition and vocational outcomes.

RESULTS

Youth demonstrated histories of academic instability, academic achievement below expectation, and high rates of untreated psychiatric disorders, the most prominent of which were anxiety, substance use, and mood disorders. Of those who had a mental health diagnosis, more than half demonstrated cognitive deficits. Performance on measures of working memory and verbal memory was <70% of that of the age-matched normative population. Cognitive impairment was associated with a significant risk for making a wage insufficient for independent living.

CONCLUSIONS

These data confirm the need to focus on cognitive as well as emotional and physical health in transition-age youth. Comprehensive intervention at this later developmental stage has the potential to facilitate the acquisition of skills needed for academic, vocational, and independent living success in adulthood.

Housing instability among people who inject drugs: results from the Australian needle and syringe program survey

High rates of substance dependence are consistently documented among homeless people, and are associated with a broad range of negative outcomes among this population. Investigations of homelessness among drug users are less readily available. This study examined the prevalence and correlates of housing instability among clients of needle syringe programs (NSPs) via the Australian NSP Survey, annual cross-sectional seroprevalence studies among NSP attendees. Following self-completion of a brief, anonymous survey and provision of a capillary blood sample by 2,396 NSP clients, multivariate logistic regressions identified the variables independently associated with housing instability. Nineteen percent of ANSPS participants reported current unstable housing, with primary ('sleeping rough'; 5 %), secondary (staying with friends/relatives or in specialist homelessness services; 8 %), and tertiary (residential arrangements involving neither secure lease nor private facilities; 6 %) homelessness all evident. Extensive histories of housing instability were apparent among the sample: 66 % reported at least one period of sleeping rough, while 77 % had shifted between friends/relatives (73 %) and/or resided in crisis accommodation (52 %). Participants with a history of homelessness had cycled in and out of homelessness over an average of 10 years; and one third reported first being homeless before age 15. Compared to their stably housed counterparts, unstably housed participants were younger, more likely to be male, of Indigenous Australian descent, and to report previous incarceration; they also reported higher rates of key risk behaviors including public injecting and receptive sharing of injecting equipment. The high prevalence of both historical and current housing instability among this group, particularly when considered in the light of other research documenting the many adverse outcomes associated with this particular form of disadvantage, highlights the need for increased supply of secure, affordable public housing in locations removed from established drug markets and serviced by health, social, and welfare support agencies.

The mental and physical health of homeless youth: a literature review

Youth homelessness is a growing concern in the United States. Despite difficulties studying this population due to inconsistent definitions of what it means to be a youth and homeless, the current body of research indicates that abuse, family breakdown, and disruptive family relationships are common contributing factors to youth homelessness. Moreover, the experience of homelessness appears to have numerous adverse implications and to affect neurocognitive development and academics, as well as mental and physical health. Substance use, sexually transmitted infections, and psychiatric disorders are particularly prevalent in this population. Whereas some of these problems may be short-lived, the chronic stress and deprivation associated with homelessness may have long-term effects on development and functioning. Further, difficulties accessing adequate and developmentally-appropriate health care contribute to more serious health concerns. Suggestions for future research and interventions are discussed.

Physical and mental health, cognitive development, and health care use by housing status of low-income young children in 20 American cities: a prospective cohort study

OBJECTIVES

We assessed the independent effect of homeless and doubled-up episodes on physical and mental health, cognitive development, and health care use among children.

METHODS

We used data from 4 waves of the Fragile Families and Child Wellbeing Study, involving a sample of 2631 low-income children in 20 large US cities who have been followed since birth. Multivariate analyses involved logistic regression using the hybrid method to include both fixed and random effects.

RESULTS

Of the sample, 9.8% experienced homelessness and an additional 23.6% had a doubled-up episode. Housing status had little significant adverse effect on child physical or mental health, cognitive development, or health care use.

CONCLUSIONS

Family and environmental stressors common to many children in poverty, rather than just homeless and doubled-up episodes, were associated with young children's poor health and cognitive development and high health care use. Practitioners need to identify and respond to parental and family needs for support services in addition to housing assistance to effectively improve the health and development of young children who experience residential instability, particularly those in homeless families.

A systematic review of cognitive deficits in homeless adults: implications for service delivery

OBJECTIVE

The primary goals of this systematic review were to assess studies of homeless adults and cognitive functioning, and to explore the clinical implications and potential impacts on social functioning of these cognitive deficits.

METHOD

The MEDLINE, CINAHL, EMBASE, PsycINFO, Applied Social Sciences Index and Abstracts, ERIC, Social Sciences Abstracts, Social Sciences Citation Index, Social Services Abstracts, and Sociological Abstracts databases were searched from 1970 (or their inception) to October 2007. Abstracts from 582 studies were screened and 22 studies were found to meet inclusion criteria (published in the English language, reported results of neuropsychological tests, or screening tests for cognitive dysfunction in homeless people aged 18 years or older). Two investigators independently reviewed each study and rated its quality based on well-defined criteria.

RESULTS

Ten studies were of good or fair quality. Studies that administered the Mini Mental State Examination indicate about 4% to 7% of homeless people exhibit global cognitive deficits. Focal deficits in verbal and visual memory, attention, speed of cognitive processing, and executive function were also apparent. No studies of the functional implications of cognitive deficits were found.

CONCLUSIONS

Cognitive deficits in homeless people likely have a significant mediating impact on the effectiveness of skills training and rehabilitation programs. Clinicians should be cognizant that cognitive deficits probably impair homeless patients' ability to maintain housing stability and follow treatment recommendations. Implications for housing options and health service delivery should also be considered. Research is lacking on interventions to improve cognitive functioning in the homeless.