Open research questions in Down syndrome and intellectual disability research

What the literature leaves open

• However, reliable data are lacking on population level need for rehabilitation services and assistive products (AP) in different settings for evidence-based policy and programme planning.

  Development of a Functional Needs Assessment Tool to estimate population level functional difficulties and need for services and assistive products · 2026 · DOI

• Because EF was not assessed in participants with ID, it remains unclear whether they exhibited an EF deficit relative to the VA-matched TD group. To support generalization of the findings, the task’s validity and reliability in children with ID should be investigated, for example by examining correlations with real-life dressing performance or by assessing test–retest reliability. Nevertheless, systematic examination of etiological effects is warranted in future research.

  Script Execution and Turning Back by Children with Intellectual Disability: An Investigation Using Dressing Scripts · 2026 · DOI

• Moving forward Research Further research is required regarding ethnicity and its relation to premature deaths. 82 Moving Forward Care and services Research Further research is required to explore the extent to which conditions other than COVID-19 contribute to excess deaths as more data become available. Improving data collection or utilising other sources of data to increase the breadth of data collected, for example prescriptions and other treatments, and long term conditions, should be explored. We note that due to the recent switch to a new format for collecting LeDeR data, there will be limited data on clinical factors such as long-term health conditions. With the new system in place for data collection, there are more limited data on clinical factors such as long-term health conditions. 80 Impact of COVID-19 vaccination on deaths of people with a learning disability There were limited data on vaccination status – of all of the deaths during 2021, only 304 (11. Although we had limited data on vaccination status, we found that being unvaccinated was strongly associated with deaths due to COVID-19 during 2021.

  An Exploration of the Characteristics of Adults Being Screened Using an Online Intellectual Disability Screening Tool · 2026 · DOI

• insightful topic. Future research should build on this initial study by investigating what co-production activities are evident in a broader range of community-based services for children with intellectual disabilities and behaviours that challenge, utilising more in-depth methodologies to better understand what co- 13 Page 33…

  Co-production within community-based services for children with intellectual disabilities and behaviours that challenge in England · 2026 · DOI

• evident in a broader range of community-based services for children with intellectual disabilities and (Sutherland et al. 2025). As higher-level definitions of co-production often have funding implications production is occurring (e.g., documentary analysis, ethnography), as well as investigating in more Future research should build on this initial study by investigating what co-production activities are Research should also endeavour to consider how these findings fit within broader debates around services to address their lack of current representation in this area. Furthermore, research should underpinning how these are conducted and what makes them effective. challenging/barriers for parents/carers to be involved e.g., emotional and cognitive labour activities.

  Co-production within community-based services for children with intellectual disabilities and behaviours that challenge in England · 2026 · DOI

• Future research should consider a comparative analysis of physical disability representation across multiple studios, including other animation giants like DreamWorks, and across various film genres.

  “Little Freak…Yes, Him with Those Ears Only a Mother Could Love”: Representation of Physical Disability in Disney Across Three Eras · 2026 · DOI

• Adolescents and young adults with intellectual and developmental disabilities (IDs) experience disproportionately low physical activity and high sedentary time yet remain insufficiently served by scalable and cognitively accessible health-enhancing physical activity (HEPA) programmes.

  A co-designed gamified mHealth platform for adolescents and young adults with intellectual and developmental disabilities: System architecture and mixed-methods proof-of-concept · 2026 · DOI

• Parental internal strains (e.g., emotional exhaustion, sleep deprivation, guilt, temporary withdrawal) are documented qualitatively, but quantitative measures linking specific parental strain profiles (e.g., burnout severity, depression screening scores, sleep hours) to child resilience outcomes and caregiver-child interaction quality are absent from this multi-case study of intellectual disabilities.

  Adversity and Resilience in Children With Moderate-to-profound Intellectual Disabilities: A Multi-source, Multiple-case Study Across Developmental Stages · 2026 · DOI

• The multi-source data collection (interviews, checklists, case files) is acknowledged to use generalized descriptors to protect identifiability, but this de-identification strategy may obscure critical clinical details (e.g., specific genetic syndromes, exact medication regimens, precise airway management protocols) necessary for replicating resilience-promoting interventions across children with similar moderate-to-profound intellectual disability presentations.

  Adversity and Resilience in Children With Moderate-to-profound Intellectual Disabilities: A Multi-source, Multiple-case Study Across Developmental Stages · 2026 · DOI

• Children R2 through R7 show marked improvements following medical stabilization, specialized diagnosis, or caregiver consistency, yet the paper does not isolate which single or clustered intervention components (e.g., seizure management pharmacotherapy, predictable routine establishment, communication device introduction, foster placement timing) produce the most significant resilience gains in children with moderate-to-profound intellectual disabilities.

  Adversity and Resilience in Children With Moderate-to-profound Intellectual Disabilities: A Multi-source, Multiple-case Study Across Developmental Stages · 2026 · DOI

• The study identifies systemic failures (e.g., 'limited early parental presence due to historical policy,' 'exclusion from adapted activities,' 'occasional staff disrespect') as contributors to cumulative adversity in children with intellectual disabilities, but does not measure or compare the magnitude of impact of specific institutional/policy barriers versus family-level adversities on resilience outcomes across the developmental stages examined.

  Adversity and Resilience in Children With Moderate-to-profound Intellectual Disabilities: A Multi-source, Multiple-case Study Across Developmental Stages · 2026 · DOI

• Table 8 and Table 9 document parental meaning-making and reframing of childhood adversities, but the paper does not specify which narrative reframing strategies (e.g., 'stand my ground,' 'heavy backpack yet strong family') correlate with improved parental mental health outcomes, reduced burnout, or enhanced advocacy for children with moderate-to-profound intellectual disabilities. Targeted intervention studies testing narrative restructuring approaches are absent.

  Adversity and Resilience in Children With Moderate-to-profound Intellectual Disabilities: A Multi-source, Multiple-case Study Across Developmental Stages · 2026 · DOI

• The case summaries reveal that children with identical medical complications (e.g., gastrostomy dependence, prolonged ICU admission, nocturnal epilepsy) show divergent resilience trajectories, yet the study lacks systematic quantification of the threshold or dosage of protective family factors (e.g., consistent caregiver presence, access to early intervention, household stability) required to buffer against cumulative medical adversity in children with intellectual disabilities.

  Adversity and Resilience in Children With Moderate-to-profound Intellectual Disabilities: A Multi-source, Multiple-case Study Across Developmental Stages · 2026 · DOI

• The study documents parental adversities retrospectively through interview recall and case files, but does not systematically measure the temporal relationship between specific parental childhood adversities (e.g., sexual abuse, bullying, medical trauma) and their subsequent parenting capacities, emotional regulation, or advocacy effectiveness for children with moderate-to-profound intellectual disabilities. Prospective longitudinal assessment of this intergenerational transmission mechanism is needed.

  Adversity and Resilience in Children With Moderate-to-profound Intellectual Disabilities: A Multi-source, Multiple-case Study Across Developmental Stages · 2026 · DOI

• The impact of long-term services and supports on the quality of life of adults with intellectual and developmental disabilities (IDD) is not well understood given the highly complex nature of researching this topic.

  Outcomes for Adults With Intellectual and Developmental Disabilities Receiving Long-Term Services and Supports: A Systematic Review of the Literature · 2024 · DOI

• Despite a growing number of adults with intellectual and developmental disabilities (IDD) and documented risk for adverse outcomes as they age, little is known about the health and healthcare patterns of adults with different IDD throughout adulthood.

  Chronic Health Conditions Among Adults With Intellectual and Developmental Disabilities in a State Medicaid System · 2024 · DOI

• The limited research to date documents that trainees with sensory disabilities (TSD) report extensive barriers and are consistently under-represented in clinical settings.

  Guidelines to address barriers in clinical training for trainees with sensory disabilities. · 2021 · DOI

• Furthermore, these professional caregivers described feelings of failure and powerlessness if they could not assess or fulfil the needs of persons with PIMD.

  The perspectives of professional caregivers on quality of life of persons with profound intellectual and multiple disabilities: a qualitative study · 2020 · DOI

• The authors make a compelling case that additional research is needed to better understand the exact nature of the mental health conditions experienced by people with ID, that medical and allied health professionals need additional training in this area, and that availability of interventions and services in the community need to be expanded in order to prevent conditions from escalating to emergency status.

  Introduction to the Special Issue on Health, Health Promotion, and Health Care for People With Intellectual Disability · 2019 · DOI

• Attendance at a single DA meeting does not increase staff perceptions of self-efficacy, however, staff find the process of DA helpful as it encourages reflection on their interactions with individuals with intellectual disability and challenging behaviour and attuning of their interactions, though further research is needed.

  Discovery awareness for staff supporting individuals with intellectual disabilities and challenging behaviour: is it helpful and does it increase self-efficacy? · 2019 · DOI

• The purpose of this study is to begin to fill one relevant critical gap in knowledge: understanding the demographics and health outcomes of adults with IDD who receive services under Medicare Fee-for-Service (FFS), many of who are also eligible for Medicaid.

  Characteristics of Medicare Beneficiaries With Intellectual or Developmental Disabilities · 2019 · DOI

• Introduction: As opposed to studies focusing on staffs’ attributions of challenging behavior (CB), relatively few studies have looked at how people with intellectual disabilities (ID) attribute such behaviors themselves, and a systematic overview is currently lacking.

  Attributions of People with Intellectual Disabilities of Their Own or Other Clients’ Challenging Behavior: A Systematic Review of Qualitative Studies · 2019 · DOI

• OBJECTIVES: There is a growing body of evidence revealing emotion regulation difficulties are a common factor in the development and maintenance of mental health problems in the general population, however relatively little is known of the emotion regulation strategies used by people with intellectual disabilities.

  Exploring the emotion regulation strategies used by adults with intellectual disabilities · 2018 · DOI

• The inclusion of IDD as a separate category, under the neurodevelopmental disorders of the DSM-5, to affirm that it is a health condition, remains controversial (Bertelli, Salvador-Carulla, & Harris, 2016).

  Book Review: Diagnostic Manual – Intellectual Disability (DM-ID 2): Textbook of Diagnosis of Mental Disorders in Persons With Intellectual Disability · 2018 · DOI

• States are reforming their Medicaid LTSS programs from a fee-for-service model to a Medicaid managed LTSS (MLTSS) approach, anticipating improved quality of care and reduced costs, although there is limited evidence of MLTSS effectiveness.

  Implementation of Medicaid Managed Long-Term Services and Supports for Adults With Intellectual and/or Developmental Disabilities in Kansas · 2017 · DOI

Most-cited papers in Down syndrome and intellectual disability research

• Trends in the Prevalence of Developmental Disabilities in US Children, 1997–2008 · PEDIATRICS · 2011 · 1,361 citations
• Mental ill-health in adults with intellectual disabilities: prevalence and associated factors · The British Journal of Psychiatry · 2006 · 1,047 citations
• The Neurodiversity Approach(es): What Are They and What Do They Mean for Researchers? · Human Development · 2022 · 441 citations
• An Overview of <i>Intellectual Disability: Definition, Diagnosis, Classification, and Systems of Supports</i> (12th ed.) · American Journal on Intellectual and Developmental Disabilities · 2021 · 406 citations
• Mental disorder in adults with intellectual disability. 1: Prevalence of functional psychiatric illness among a community‐based population aged between 16 and 64 years · Journal of Intellectual Disability Research · 2001 · 364 citations
• Community participation of people with an intellectual disability: a review of empirical findings · Journal of Intellectual Disability Research · 2008 · 343 citations
• Prevalence estimates of mental health problems in children and adolescents with intellectual disability: A systematic review and meta-analysis · Australian & New Zealand Journal of Psychiatry · 2020 · 190 citations
• Deprivation, ethnicity and the prevalence of intellectual and developmental disabilities · Journal of Epidemiology & Community Health · 2010 · 181 citations
• Social support and intellectual disabilities: a comparison between social networks of adults with intellectual disability and those with physical disability · Journal of Intellectual Disability Research · 2009 · 175 citations
• The State of the Science of Health and Wellness for Adults With Intellectual and Developmental Disabilities · Intellectual and developmental disabilities · 2013 · 174 citations

Most recent work

• Blinded by the dollar, neglecting people’s care. Commentary on “Federal Court cases about harm to people with intellectual disabilities in service provision” (Hough et al., 2026) · Research and Practice in Intellectual and Developmental Disabilities · 2026
• Circadian Rest-Activity Rhythms, Cognition, and Alzheimer Disease Dementia in Adults With Down Syndrome · Neurology · 2026
• Promoting healthy behaviours in young people with intellectual disabilities: a pilot RCT of an mHealth-based intervention targeting physical activity and sedentary behaviour · Disability and Rehabilitation Assistive Technology · 2026
• Assessing maladaptive stress response patterns in individuals with intellectual disabilities: Development and preliminary validation of the MSRP-Q · Journal of Intellectual Disabilities · 2026
• Implementing system-wide positive behaviour support through capable environments: a practice-based evaluation · Tizard Learning Disability Review · 2026
• Empowering Voices: The Impact of Choice-Making on Voting Opportunity Among People with Intellectual and Developmental Disabilities · Inclusion · 2026
• The legacy of LaVigna and Willis: how MEBS shaped the evolution of PBS in the UK · Tizard Learning Disability Review · 2026
• Adversity and Resilience in Children With Moderate-to-profound Intellectual Disabilities: A Multi-source, Multiple-case Study Across Developmental Stages · Adversity and Resilience Science · 2026
• Health-care access and experiences of people with a learning disability from an ethnic minority background: service user and informal carer perspectives · Advances in Mental Health and Intellectual Disabilities · 2026
• Assessing the Knowledge of Undergraduate Nursing Students on Intellectual Disability · Nursing Education Perspectives · 2026

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