Intellectual Disability Research Articles

Reliability and Validity of the Diagnostic Interview Trauma and Stressors- Intellectual Disability in Adults with Mild Intellectual Disabilities or Borderline Intellectual Functioning

ABSTRACT Objective To assess the reliability and construct validity of the Diagnostic Interview Trauma and Stressors- Intellectual Disability – Adult version (DITS-ID-adults) in adults with mild intellectual disabilities or borderline intellectual functioning (MID-BIF). Method The DITS-ID-adults, Brief Symptom Inventory–18 (BSI–18), and Impact of Event Scale-Intellectual Disability (IES – ID) were administered to 97 participants with MID-BIF who lived in supported housing. The Anxiety, Depression, and Mood Scale (ADESS) and Behavior Problems Inventory (BPI) were administered to their relatives. Results The interrater reliability of the DITS-ID-adults was good to excellent. The construct validity of the DITS-ID-adults was good, based on positive correlations between the BSI–18, IES-ID, ADESS and DITS-ID-adults, and mainly positive correlations between the BPI and DITS-ID-adults (r = .21 to r = .75). Reporting potentially traumatic events listed under the A criterium for PTSD was associated with fulfilling PTSD symptom criteria. In this sample, 58% were classified with post-traumatic stress disorder (PTSD) according to the DITS-ID-adults, while PTSD diagnosis on file was low (7%). Conclusion The present findings support the DITS-ID-adults as a reliable and valid basis for classifying PTSD in individuals with MID-BIF.

Outcome Measures in intellectual disability: A Review and narrative synthesis of validated instruments.

Outcome measurement is essential to determine the effectiveness of health interventions and improve the quality of services. The interplay of social, individual, and biological factors makes this a complex process in the psychiatry of people with intellectual disability (PwID). Review of outcome measures which are validated in PwID. A PRISMA-guided review was conducted, using a predefined criteria and a relevant word combination on four databases: EMBASE, Medline, CINAHL and PsycINFO. Each included study was examined for relevance to intellectual disability psychiatry. The psychometric data of each tool was critically assessed. Findings were narratively synthesised. Of 1,548 articles, 35 met the inclusion criteria. Several outcome measures were identified relevant to intellectual disability psychiatry, including tools for challenging/offending behavior, specific neurodevelopmental/clinical conditions such as ADHD, epilepsy, and dementia however, psychometric properties, validity and reliability varied considerably. The tools identified were largely clinician rated, with a dearth of measures suitable for completion by patients or their family carers. Most outcome measures used for PwID lack suitable psychometric properties including validity or reliability for use within the ID population. Of importance, those with alternative expression or are non-verbal have been excluded from the research developing and reporting on measurement instruments. There is an underserved population who risk being left behind in the era of value-based medicine and increasing use of outcome measurement when assessing the effectiveness of healthcare interventions on individual and population levels. This is the first of its kind review in this area.

"They helped me stand on my own two feet": Canadian parents with intellectual disabilities in child protection.

Research on the lived experience of Canadian parents with intellectual disabilities involved in child protection is limited, particularly inclusive research with parents with intellectual disabilities involved in Canada's changing child protection system. This inclusive study was done in collaboration with a co-researcher with intellectual disabilities who had lived experience as a parent. 13 parents from three Canadian regions participated in semistructured interviews about their involvement in child protection. Four major themes emerged in the findings: 1) key supports that contributed to positive outcomes; 2) parents' attitudes toward child protection agencies and perceived attitudes about themselves; 3) systemic barriers impacting accessibility and the child protection experience; and 4) parents' advice to other parents and professionals in child protection. This study provides a promising picture of child protection agencies as a key support despite existing barriers. Implications for social service providers are offered and areas for further exploration are discussed.

Experiences and Challenges of Teachers in Handling Learners with Intellectual Disability During Covid-19 Pandemic

This study delved into the list of significant challenges that teachers were experiencing in handling ID learners. It employed a qualitative method in gathering data on teachers-participants’ experiences and challenges. A total of 20 teachers were selected using a convenient purposive sampling as the participants. The findings of this study revealed that teacher participants have observed and experienced multifaceted scenarios and difficulties during the COVID-19 pandemic. The data showed the existence of the challenges based on DepEd support, the lack of governmental provision of devices to aid learning, the limited learning experience, and instructional time that affect the learner’s personality, social orientations, and performance due to the absence of direct instruction. Likewise, the study concluded that the COVID-19 pandemic has affected and brought challenges to teachers and learners and has created the failure of support from the DepEd and the government. It conveyed the importance of parental support without the teacher’s direct instruction. Hence, it is recommended that schools enhance teacher training, prioritize face-to-face instruction, strengthen parental support, increase resource allocation, promote inclusive practices, and conduct further research on effective strategies.

Clinical Utility of Virtual Kitchen Errand Task for Children (VKET-C) as a Functional Cognition Evaluation for Children with Developmental Disabilities

Background/Objectives: This study evaluated the clinical utility of a virtual reality (VR)-based kitchen error task for children (VKET-C) to assess functional cognition in children. Methods: In total, 38 children aged 7–12 years were included, comprising 23 typically developing (TD) children and 15 children with developmental disabilities (DDs), including autism spectrum disorder, attention deficit hyperactivity disorder, and intellectual disability. While performing the VKET-C, performance errors were analyzed. The Stockings of Cambridge (SOC) and Spatial Working Memory (SWM) tasks from the Cambridge Neuropsychological Test Automated Battery (CANTAB) were used to assess cognitive function. The Brunner–Munzel test was performed to compare performance errors between the TD and DD groups, and correlations between performance errors and cognitive measures were analyzed. Results: Omission and commission errors were significantly different between the groups (p < 0.001), with no significant difference in motor errors (p > 0.05). Omission errors were correlated with the initial thinking time mean (ITMN) in all items of the SOC task and the between errors (BE) of the SWM task. Commission errors were correlated with the ITMN in the difficult items of the SOC task and the BE of the SWM task. Additionally, motor errors were significantly correlated with problems solved in minimum moves (PSMM) and ITMN in the difficult items of the SOC task and BE in the SWM task. Conclusions: The VKET-C shows promise as an effective tool for assessing executive function and working memory in children with DDs, offering an engaging and ecologically valid alternative to traditional methods.

Adaptive behavior in primary agenesis of the corpus callosum

Background and aimsPrimary agenesis of the corpus callosum (ACC) is a congenital neurological disorder characterized by the absence, either partial or complete, of the corpus callosum in individuals who do not have intellectual disability and are otherwise neurologically asymptomatic. While mild to moderate neurocognitive deficits have been observed in individuals with primary ACC using neuropsychological assessments, the impact of this syndrome on adaptive behavior remains insufficiently understood. MethodsThis study used self- and informant-ratings on the Adaptive Behavior Assessment System, Second Edition (ABAS-II) to evaluate adaptive behavior in 35 adults diagnosed with primary ACC. ResultsWhile adults with primary ACC reported adaptive functioning comparable to an age-adjusted normative sample, family informants rated their adaptive ability below norms in several skill domains, particularly social skills. ConclusionsThis pattern of lower ratings by informants than self-ratings suggests adults with ACC may have poor understanding of their own behavior and its consequences. This study demonstrates that informants observe significant deficiencies in the conceptual, social, and practical aspects of adaptive behavior in persons with primary ACC, and that these deficiencies are not seen as clearly by the persons themselves.

Autism Early Intervention - Progress, Steps Backward, and the Reconciliation of Conflicting Narratives.

We review recent research on interventions, services and supports for children on the autism spectrum, examining both advancements and setbacks. Progress has included an increase in quantity and rigor of intervention science, as well as a broadening of disciplines and perspectives engaged in the examination of early interventions, including their effectiveness, social validity and the contextual determinants of implementation outcomes. Setbacks have included the decrease in research involving children on the autism spectrum who have co-occurring profound intellectual disability, minimal or no spoken language, and who require constant assistance with daily living activities. This trend is alarming because it contributes to the marginalization and unmet needs of children who need intervention the most. Additionally, access to early intervention services is unequal and complicated by the misalignment of policy with the evolving evidence base in the field. The recent growth in the depth and breadth of knowledge related to autism early intervention means that policies, practices, advocacy efforts and research directions can be grounded on a more comprehensive evidence base and societal appraisal of autism. Nevertheless, these indisputable markers of success co-exist with conflicting narratives that hinder the establishment of a cohesive agenda to tackle inequities experienced by marginalized subgroups. Reconciliation of conflicting narratives requires a nuanced and compassionate appraisal of sources of tensions and heterogeneity of needs within the autism spectrum.

A novel MAOA gene variant: Brunner syndrome, a rare syndrome, is associated with a wide range of psychiatric symptoms.

Brunner syndrome is a rare genetic disorder that associated with mutations in the MAOA gene. It has been linked to a number of psychiatric disorders. We present detailed information on psychiatric evaluation of a case carrying a novel MAOA gene variant of p.(Thr408Met). The patient was referred to our clinic with a history of attention problems, motor coordination difficulties and a tendency to bite objects. Following a comprehensive psychiatric evaluation, the patient was diagnosed with developmental coordination disorder, articulation disorder and attention deficit hyperactivity disorder (ADHD). MAOA mutations are rarely reported in the literature. To date, a total of 23 MAOA gene variants, mostly missense variants, have been reported through the HGMD database (Professional 2023.4). Neurodevelopmental symptoms may vary in severity and diversity among patients with Brunner syndrome. Different degrees of intellectual disability have been found in previously reviewed cohorts of Brunner syndrome. In our affected patient, cognitive development and academic achievement were at a similar level to his peers. Additionally, our patient exhibited symptoms suggestive of developmental coordination disorder. Our findings show that genetic mutations in MAOA can lead to a wide range of clinical symptoms and underline the need for comprehensive genetic and clinical evaluations.

Exploring Implementation of Reasonable Adjustments in Hospitals for People With Intellectual Disability: Using a Realist Lens.

To explore the factors influencing the implementation of reasonable adjustments in hospitals for people with intellectual disability: using a realist lens. A qualitative study using a realist lens. Data collection involved one focus group interview and three semi-structured interviews with healthcare professionals working in hospital or community settings in September 2023. Data were analysed using qualitative content analysis and findings were mapped to the Context and Implementation of Complex Interventions (CICI) framework across the dimension's context, implementation and setting. Healthcare professionals support the provision of reasonable adjustments in acute hospitals as a person-centred approach to caring for people with intellectual disability. While reasonable adjustments are evident in practice, they are mostly individual-level cases with little evidence of strategic system-level implementation. The factors influencing the implementation of reasonable adjustments in practice were conceptualised using the CICI framework. Context factors spanned the domains of epidemiological (e.g., ageing population), socio-cultural (e.g., historical healthcare), political (e.g., lack of integrated care pathways) and ethical (e.g., provision of person-centred care). Implementation factors spanned the domains of strategies (e.g., leadership strategies), agents (e.g., liaison and advocacy roles) and outcomes (e.g., individual-level reasonable adjustments). The setting for the complex intervention was the acute hospital. System-level indicators for successful implementation include intellectual disability specific policies/procedures for integrated care pathways, education and awareness training for hospital staff, and leadership strategies such as the development of liaison nursing roles and the appropriate allocation of physical and human resources. A radical change is needed where implementation of reasonable adjustments in acute hospitals are broadened beyond isolated individual-level cases to system-level healthcare. This research highlights the importance of exploring the integrated dimensions of context, implementation and setting in complex interventions such as reasonable adjustments and sets foundation for further implementation research in this area. Reasonable adjustments at the system-level within acute hospitals would promote person-centred care and help address the inequities and health disparities experienced by people with intellectual disability. This research uses a realist lens to explore the factors influencing the implementation of reasonable adjustments in acute hospitals for people with intellectual disability. The factors influencing the implementation of reasonable adjustments in practice were conceptualised using the CICI framework across the dimensions of context (domains epidemiological, socio-cultural, political and ethical), implementation (domains strategies, agents and outcomes) and setting. System-level indicators for successful implementation include intellectual disability specific policies/procedures for integrated care pathways, education and awareness training for hospital staff, and leadership strategies such as the development of liaison nursing roles and the appropriate allocation of physical and human resources. This research highlights the importance of exploring the integrated dimensions of context, implementation and setting of complex interventions such as reasonable adjustments and sets a foundation for further implementation research in this area. This research adhered to the Equator research reporting guideline: standards for reporting qualitative research. A parent of a child with intellectual disability was involved in the conduct of this research, specifically in the design, data collection and preparation of the manuscript.

'It's Got Its Ups and Downs': What People With Intellectual Disabilities Living in Supported Living and Residential Care Like and Dislike About Their Home.

Given the current sociopolitical climate, people with intellectual disabilities are spending more time at home. Much housing-related research focuses on informant-completed measures and quantifiable outcomes. By contrast, this article explores the perspectives of adults with intellectual disabilities concerning what they liked or disliked about their homes. Data is drawn from 53 semi-structured interviews with people with intellectual disabilities in supported living or residential care in England. Three themes were generated: space and place; people make or break a home; and day-to-day autonomy. These highlight the importance of belonging and the significance of other people in the creation of 'home'. If people are to flourish, attention must be paid to aspects of the home that provide comfort, enjoyment, and a sense of belonging. These findings can benefit professionals, family members and people with intellectual disabilities, when considering current or future living arrangements.

Feasibility, Experiences and Short-Term Outcomes on Challenging Behaviour and Well-Being of a Partially Online Music Intervention Pilot Study for Adults With Intellectual Disabilities.

During the COVID-19 pandemic we implemented a partially online music intervention to examine the feasibility, experiences and short-term outcomes on the challenging behaviour and well-being of adults with intellectual disabilities. This mixed-methods study included 10 participants with mild or moderate intellectual disabilities who received 16 one-hour individual music sessions in 10 weeks, either face-to-face or online. Data on feasibility and experiences from participants and music workers were collected and analysed using inductive thematic analysis. Challenging behaviour and well-being were measured before and after intervention. Overall experiences were positive and concerned appreciation, positive feelings, musical abilities, attention span, relatedness and personalisation. Online experiences varied, but most participants preferred face-to-face over online sessions. After the intervention, challenging behaviour scores were better than before. Engaging in a partially online music intervention is feasible for people with intellectual disabilities and seems to improve challenging behaviour. Experiences are discussed and recommendations for future online sessions are provided.

Mental Health Services for Adults With Intellectual Disabilities: A Qualitative Study of Patient Characteristics, Associated Factors and Consequent Needs for Adaptation in Assessment and Treatment.

Individuals with intellectual disabilities are at increased risk of mental health disorders, but may struggle to access appropriate services. While assessment/treatment may need to be adapted, knowledge is limited about what such adaptations may entail. During a service development project, the participants (33 professionals, 13 family members) were asked to identify the characteristics/associated factors of individuals with intellectual disabilities and co-occurring mental health disorders. Using thematic analysis, 1103 participant responses were analyzed to identify the needs for adaptation in assessment/treatment. Three core themes were identified: (1) A broader assessment: Gaining an accurate and comprehensive understanding of the individual's history, abilities and difficulties, (2) Adjusting/modifying existing treatment strategies, (3) Ensuring that the individual's day-to-day needs are met. According to the participants, assessment/treatment of mental health disorder in this population requires more time and broader assessments are necessary. Family/caregiver involvement and cross-service organisation/collaboration represent other important adaptations.

BCL11A intellectual developmental disorder: defining the clinical spectrum and genotype-phenotype correlations.

An increasing number of individuals with intellectual developmental disorder (IDD) and heterozygous variants in BCL11A are identified, yet our knowledge of manifestations and mutational spectrum is lacking. To address this, we performed detailed analysis of 42 individuals with BCL11A-related IDD (BCL11A-IDD, a.k.a. Dias-Logan syndrome) ascertained through an international collaborative network, and reviewed 35 additional previously reported patients. Analysis of 77 affected individuals identified 60 unique disease-causing variants (30 frameshift, 7 missense, 6 splice-site, 17 stop-gain) and 8 unique BCL11A microdeletions. We define the most prevalent features of BCL11A-IDD: IDD, postnatal-onset microcephaly, hypotonia, behavioral abnormalities, autism spectrum disorder, and persistence of fetal hemoglobin (HbF), and identify autonomic dysregulation as new feature. BCL11A-IDD is distinguished from 2p16 microdeletion syndrome, which has a higher incidence of congenital anomalies. Our results underscore BCL11A as an important transcription factor in human hindbrain development, identifying a previously underrecognized phenotype of a small brainstem with a reduced pons/medulla ratio. Genotype-phenotype correlation revealed an isoform-dependent trend in severity of truncating variants: those affecting all isoforms are associated with higher frequency of hypotonia, and those affecting the long (BCL11A-L) and extra-long (-XL) isoforms, sparing the short (-S), are associated with higher frequency of postnatal microcephaly. With the largest international cohort to date, this study highlights persistence of fetal hemoglobin as a consistent biomarker and hindbrain abnormalities as a common feature. It contributes significantly to our understanding of BCL11A-IDD through an extensive unbiased multi-center assessment, providing valuable insights for diagnosis, management and counselling, and into BCL11A's role in brain development.

What is it like to be a twin of a person with profound intellectual and multiple disabilities?

ABSTRACT Background The aim of this study was to establish the perceived quality of life in twin siblings of individuals with profound intellectual and multiple disabilities (PIMD) living in Poland. Method Semi-structured interviews were conducted with siblings of people with PMID. The interviews were subjected to thematic analysis according to grounded theory methodology principles. Findings The results of this study yielded insights into the quality of life of twin siblings of persons with profound intellectual and multiple disabilities. Inquired about their lives in the capacity of siblings, the interviewees provided a narrative around their experiences as twins of individuals with PIMD. Conclusion Research participants described both positive and negative experiences, indicating that having a sibling with profound intellectual and multiple disabilities affected their quality of life in diverse ways. In addition, the obtained results may be of cognitive merit to practitioners and researchers working with families of people with PIMD.

Pattern of Injuries in Children with Epilepsy: A Hospital-Based Case-Control Study

Abstract Objective The aim of this study is to examine the profile and pattern of injuries in children with epilepsy (CWE) as compared with healthy controls. Methods This prospective, cross-sectional study conducted over 1 year in a tertiary care pediatric center included consecutive CWE aged 4 to 16 years who had active seizures during the preceding 1 year. A similar number of age- and sex-matched healthy controls were enrolled. Children with acute symptomatic seizures or degenerative neurologic disorders were excluded. Standardized scales were used to assess intelligent quotient, psychopathology, seizure severity, and restriction of daily activities. Results Two hundred and eight CWE (mean age: 107 ± 37months; range: 3.5–16 years) and an equal number of healthy controls (mean age: 108 ± 43 months; range: 3.5–16 years; p = 0.07) were evaluated. The majority of CWE had generalized epilepsy (n = 117, 59.6%) followed by focal epilepsy (n = 84, 40.3%). The mean duration of epilepsy was 47.4 ± 36.3 months. The prevalence of injury was significantly greater in CWE (n = 118/208, 56.7%) compared with controls (n = 56/208, 26.9%; p < 0.001). CWE suffered significantly greater number of 293 injuries in the past 1 year in contrast to 83 injuries in controls (p < 0.001). In CWE, the majority of injuries were unrelated to seizures (n = 85/118, 72%, 211 injuries), while only one-third (n = 33/118, 27.9%, 82 injuries) suffered seizure-related injuries. The incidence of injures unrelated to seizures and that of seizure-related injuries were similar (2.48 seizure-related injuries per person per year). Among CWE, a comparison of the injury versus noninjury group showed a significantly longer duration of epilepsy (53 ± 34 vs. 40 ± 38 months, p < 0.007), higher prevalence of underlying structural etiology in generalized epilepsy (34.7 vs. 13.3%, p < 0.001), higher mean seizure severity and restriction of daily activity scores, and higher prevalence of hyperactivity (36.4 vs. 18.9%, p = 0.006) and intellectual disability (35.6 vs. 10%, p < 0.001) in the injury group. Injuries on the head, face, and upper limb were significantly more in CWE as compared with controls, and tongue injuries were found only in CWE (p =< 0.05), and were seen significantly more as seizure-related injury (n = 7 vs. 1, p < 0.001) compared with non-seizure-related injuries. The majority of injuries in children with CWE and controls were mild in nature (n = 112, 53.8% vs. n = 54, 26%; p < 0.001). Conclusions The prevalence of injuries among CWE aged between 4 and 16 years is high and is significantly greater than in healthy controls, although the majority of injuries are mild in severity in both and are non-seizure-related injuries. Longer duration of epilepsy, higher seizure severity, and restriction of daily activities, and higher prevalence of underlying structural etiology, hyperactivity, and intellectual disability are associated with injuries in CWE.

Social Inclusion for People with Intellectual Disability and on the Autism Spectrum through Assistive Technologies: Current Needs and Future Priorities

Context Contemporary technologies, such as mainstream and specialised Assistive Technologies (ATs), are seen as effective. However, there is a noticeable gap between technological progress and the ability to customise these technologies to meet the unique needs and characteristics of neurodivergent individuals, particularly those on the Autism Spectrum and people with Intellectual Disability (pwID). Purpose The goal of this study is to investigate the present requirements and future priorities acknowledged by specialists in the field regarding the progress of social inclusion for this population, making use of ATs. Methods and results A qualitative survey involving 24 international experts, and its respective thematic analysis reveals challenges in social inclusion, emphasizing communication and physical accessibility, awareness gaps, and stigma. Concurrently, issues surrounding ATs include limited access, insufficient training, and a lack of awareness and skills, with individuals, and families being inadequately involved. Conclusion and implications The study proposes strategies for overcoming these challenges, with a focus on accessibility, awareness, skills, family involvement, and customization. Identified research needs encompass scientific development, inclusive approaches, and changes in technological development paradigms.

Voltage-Gated Ion Channel Compensatory Effect in DEE: Implications for Future Therapies.

Developmental and Epileptic Encephalopathies (DEEs) represent a clinically and genetically heterogeneous group of rare and severe epilepsies. DEEs commonly begin early in infancy with frequent seizures of various types associated with intellectual disability and leading to a neurodevelopmental delay or regression. Disease-causing genomic variants have been identified in numerous genes and are implicated in over 100 types of DEEs. In this context, genes encoding voltage-gated ion channels (VGCs) play a significant role, and part of the large phenotypic variability observed in DEE patients carrying VGC mutations could be explained by the presence of genetic modifier alleles that can compensate for these mutations. This review will focus on the current knowledge of the compensatory effect of DEE-associated voltage-gated ion channels and their therapeutic implications in DEE. We will enter into detailed considerations regarding the sodium channels SCN1A, SCN2A, and SCN8A; the potassium channels KCNA1, KCNQ2, and KCNT1; and the calcium channels CACNA1A and CACNA1G.

Caregiver burden and therapeutic needs in Dravet syndrome - A national UK cross-sectional questionnaire study

Background and objectivesDravet Syndrome is a severe developmental and epileptic encephalopathy with significant care needs for affected individuals and families. Our objective was to characterise the caregiver burden and therapeutic needs of families caring for an individual with Dravet Syndrome from child to adulthood, to examine age related differences in co-morbidities, and identify current gaps in health and social care. MethodsCross-sectional national survey conducted by the patient advocacy group Dravet Syndrome UK (DSUK) emailed to registered families caring for an individual with a confirmed diagnosis of Dravet syndrome. To characterise the sample, quantitative data on demographics, diagnostic journey, co-morbidities, therapies, healthcare utilisation, social care and funding, and impact on family life were collected. Qualitative data were analysed using grounded theory to develop a model of impact and service need. Results165 out of 381 families (43 %) responded. 90 % of adult Dravet syndrome patients waited >12 months to receive a diagnosis, compared to 25 % families with a young child (p < 0.001). 96 % reported intellectual disability as co-morbidity, more frequently observed in older Dravet syndrome individuals (p < 0.001), alongside autism/autistic-like symptoms (χ2 = 15.3, df = 3 p = 0.001) and scoliosis (χ2 = 28.4, df = 3, p < 0.001). Sleep problems are associated with greater impact on caregiver's mental well-being (χ2 = 13.2, df = 2, p < 0.001). 77 % of families wished more discussions about sudden unexpected death in epilepsy (SUDEP) and 50 % rated the paediatric to adult transition experience as ‘poor’. 90 % of caregivers were unable to continue working as normal with negative impact on their quality of life (p = 0.024) and mental well-being (p = 0.007). DiscussionFamilies are profoundly impacted by Dravet syndrome. Their experience changes over time as people with Dravet syndrome become older and present with increasing levels of health, cognitive and behavioural comorbidities. Families will benefit from improved communication with health care professionals, psychosocial interventions and better access to social care.

Do Computer-Based Accommodations Matter? An Evaluation of Bundled Accommodations for Secondary Students With Mild Intellectual Disabilities

Objectives: To investigate the effectiveness of accommodation policies and teaching practices for secondary students with mild intellectual disabilities, the present study compared the probability that the secondary school accommodated students- if they received assistive technology, computer, and various combinations of accommodations for the provincial math and literacy assessments in Ontario, Canada- would acquire levels of academic achievement comparable to non-accommodated counterparts. Methods: A total of 217 bundled packages, consisting of multiple accommodations, for secondary students with mild intellectual disabilities were examined by an adjusted odds ratio method in the present study. Results: Our results suggest that the probability of achieving the literacy standards differed among students with mild intellectual disabilities in relation to who did or did not receive specific combinations of accommodations. We found that accommodations that involved computer and/or assistive technology were more beneficial for literacy, rather than the math assessment, for accommodated students with mild intellectual disabilities. Conclusion: Our findings help identify the computer-based accommodations that produced significant differential effects on literacy in students with mild intellectual disabilities. Implications for education and future research are also discussed in this paper.

Changes in the prevalence of intellectual disability among 10-year-old children in Sweden during 2011 through 2021: a total population study

BackgroundRecent studies have suggested an increasing prevalence of intellectual disability diagnoses in some countries. Our aim was to describe the trend in the prevalence of intellectual disability diagnoses in Sweden and explore whether associated sociodemographic and perinatal factors can explain changes in the prevalence.MethodsWe used a register-based nationwide cohort of residents in Sweden born between 2001 and 2011. We calculated the prevalence of intellectual disability diagnoses by age 10 for each birth cohort and the prevalence ratios in relation to the baseline year 2011, overall and by severity of intellectual disability, and comorbidity of autism and attention-deficit/hyperactivity disorder. The prevalence ratios were stratified and adjusted for associated sociodemographic and perinatal factors.ResultsAmong 1,096,800 individuals, 8,577 were diagnosed with intellectual disability by age 10. Among these, 3,949 (46%) and 2,768 (32%) were also diagnosed with autism and attention-deficit/hyperactivity disorder, respectively, and 4% were diagnosed with profound, 8% severe, 20% moderate, 52% mild, and 16% other/unspecific intellectual disability. The recorded age-10 prevalence of intellectual disability diagnoses increased from 0.64% (95% confidence interval 0.59–0.69%) in 2011 to 1.00% (0.94–1.06%) in 2021, corresponding to an annual prevalence ratio of 1.04 (1.04–1.05). The increase was, however, restricted to mild, moderate, and other/unspecific intellectual disability diagnoses, while the trends for profound and severe intellectual disability diagnoses were stable. The increasing trend was perhaps less pronounced among females and children with diagnosed attention-deficit/hyperactivity disorder, but independent of the co-occurrence of autism. The prevalence ratios did not change with stratification or adjustment for other associated demographic and perinatal factors.ConclusionThe recorded prevalence of diagnosed mild and moderate intellectual disability among 10-year-olds in Sweden has increased over the recent decade. This increase could not be explained by changes in associated sociodemographic or perinatal factors, including birth weight, gestational age, and parental age, migration status, and education at the child’s birth. The increase instead may be due to changes in diagnostic practices in Sweden over time.