A follow-up study of mortality, health conditions and associated disabilities of people with intellectual disabilities in a Swedish county

Oral health care for individuals with intellectual and developmental disabilities: A statewide model

BACKGROUND AND AIM

Effective strategies and practices can assist in forming future initiatives and policies to improve oral health for individuals with intellectual and developmental disabilities (IDD). This manuscript aims to describe the Tufts Dental Facilities (TDF), a university-state collaboration providing sustained statewide access to comprehensive oral health care for individuals with IDD.

PROGRAM DESCRIPTION

The TDF program was established in 1976 as the result of a class action lawsuit to improve medical and dental care for individuals with IDD residing at state institutions in Massachusetts. TDF, A partnership, between Tufts University School of Dental Medicine (TUSDM) and the Commonwealth of Massachusetts, is a network of seven dental clinics strategically positioned across the state. These clinics are specifically designed to meet the oral health needs of individuals with IDD. TUSDM's oral health providers with expertise in special care dentistry deliver comprehensive oral health care for over 6500 individuals with IDD, incorporating supportive care services and access to general anesthesia. Additionally, the program provides training in special care dentistry for dental residents and pre-doctoral dental students.

CONCLUSIONS

Leveraging state and university resources, TDF provides a model of a sustainable, long-term system for statewide access to oral health care for individuals with IDD.

Podiatric conditions observed in Special Olympics athletes: Contrasting data from a USA versus an international population

OBJECTIVES

Persons with intellectual disabilities frequently have podiatric conditions. Findings from the 2018 United States Summer games (USA) venues are compared to those from athletes screened at the 2019 Special Olympics World Summer Games in Abu Dhabi, United Arab Emirates (UAE).

METHODS

Data from Fit Feet screenings from 2445 United Arab Emirates (UAE) participants were compared to 1244 US participants.

RESULTS

A sampling of results that reflect significant differences in findings between the USA cohort and Abu Dhabi cohort include ankle joint range of motion, excessive abduction, hallux abducto valgus and pes planus. The overall shoe to foot mismatch was found to be 52.2%. A professional referral was recommended 27.7% of the time in the USA data and 28.5% in the Abu Dhabi data. An urgent referral was requested 5.1% of the time for the USA data and 3.7% of the time in the Abu Dhabi data.

CONCLUSION

Special Olympics athletes experience a greater prevalence of identifiable podiatric conditions as compared to the general population. Several of the conditions investigated in this study differed significantly between the international Special Olympics cohort and the USA cohort. Assessment of the feet of Special Olympics athletes can help to better appreciate the podiatric conditions in a population of individuals with intellectual disabilities. The variance identified between populations of Special Olympics athletes may be a reflection on the lack of standardization of conditions that are assessed for as well as the disparate characteristics of the clinical volunteers. Future Fit Feet events may wish to consider significant improvements in objectivity and standardization as it pertains to the conditions that are evaluated for in the Fit Feet exam.

Exploring co-occurrence of sensory, motor and neurodevelopmental problems and epilepsy in children with severe-profound intellectual disability

BACKGROUND

Severe to profound intellectual disability (SPID) is associated with multiple neurodevelopmental disorders and problems. In the most severe cases, the term profound intellectual and multiple disabilities (PIMD) is used. This study aimed to explore the co-occurring disorders and neurodevelopmental problems in a sample of twins where the proband had SPID.

METHOD

Within a population-based sample of (30 312) twins, 20 individuals with a national patient register SPID diagnosis were identified. Parent telephone interview data (screening of neurodevelopmental disorders) and register data (APGAR, birth weight, intellectual disabilities, epilepsy, motor and sensory disorders) were gathered for probands and co-twins.

RESULTS

The 20 individuals with SPID all had between one and five additional disorders or problems, with autistic traits, motor problems and epilepsy being the most common. Clear discordance was found for ID and all additional disorders and problems between probands with SPID and their non-SPID co-twins.

CONCLUSION

Children with SPID almost never present without neurodevelopmental and/or sensory and/or motor comorbidities. This heterogeneity should be reflected in clinical routine and in research targeting individuals with SPID. The results support a previously suggested conceptualization of a S/PIMD "spectrum". Autism may be considered for inclusion in future elaborations of such a S/PIMD spectrum.

Health-promotion intervention in a group home: Perspectives of residents, staff and rehabilitation professionals

Promoting healthier lifestyles in people with intellectual disabilities is important in order to improve health and reduce health inequalities. Few studies have explored how health-promotion interventions for people with intellectual disabilities in community-based settings are experienced. The aim of this study was to explore residents', staff members' and rehabilitation professionals' experiences of how a health-promotion intervention affected the habits of people living in a group home regarding eating habits and physical activities and staffs' ways of working. Semi-structured group interviews were conducted with five residents, six staff members and five rehabilitation professionals. The group discussions were analysed with content analysis separately for each group. Four different categories described residents', staff members' and rehabilitation professionals' views respectively. It is suggested that including people with intellectual disabilities as active parties throughout the process would facilitate implementation of a health-promotion profile in community residences.

Health care utilisation among older people with Down syndrome compared to specific medical guidelines for health surveillance: a Swedish national register study

BACKGROUND

Specific medical guidelines for health surveillance exist for people with Down syndrome (DS) since 25 years but knowledge of adherence to the guidelines is lacking. The guidelines were developed to avoid unnecessary suffering from preventable conditions. The aims of the study were to investigate 1) planned health care visits in relation to the co-morbidities described in specific medical guidelines as a measure of adherence, 2) unplanned health care visits as a measure of potentially unmet health care needs and 3) gender differences in health care utilisation among older people with DS.

METHODS

This register-based study includes people with DS (n = 472) from a Swedish national cohort of people with intellectual disability (n = 7936), aged 55 years or more, and with at least one support according to the disability law, in 2012. Data on inpatient and outpatient specialist health care utilisation were collected from the National Patient Register for 2002-2012.

RESULTS

A total of 3854 inpatient and outpatient specialist health care visits were recorded during the 11 years, of which 54.6% (n = 2103) were planned, 44.0% (n = 1695) unplanned and 1.4% (n = 56) lacked information. More than half of the visits, 67.0% (n = 2582) were outpatient health care thus inpatient 33% (n = 1272). Most planned visits (29.4%, n = 618) were to an ophthalmology clinic, and most unplanned visits to an internal medicine clinic (36.6%, n = 621). The most common cause for planned visits was cataract, found at least once for 32.8% in this cohort, followed by arthrosis (8.9%), epilepsy (8.9%) and dementia (6.6%). Pneumonia, pain, fractures and epilepsy each accounted for at least one unplanned visit for approximately one-fourth of the population (27.1, 26.9, 26.3 and 19.7% respectively). Men and women had similar numbers of unplanned visits. However, women were more likely to have visits for epilepsy or fractures, and men more likely for pneumonia.

CONCLUSIONS

Increased awareness of existing specific medical guidelines for people with DS is vital for preventive measures. The relatively few planned health care visits according to the medical guidelines together with a high number of unplanned visits caused by conditions which potentially can be prevented suggest a need of improved adherence to medical guidelines.

Mortality patterns and risk among older men and women with intellectual disability: a Swedish national retrospective cohort study

Background

Sweden has closed all institutions and imposed legislation to ensure service and support for individuals with intellectual disability (ID). Understanding mortality among older individuals with ID is essential to inform development of health promotion and disease control strategies. We investigated patterns and risk of mortality among older adults with ID in Sweden.

Methods

This retrospective cohort study compared older adults aged 55 years and older with ID with a control population. Participants were followed during 2002–2015 or death, and censored if they moved out of Sweden. Individuals with ID were identified from two national registers: one covering all specialist health-care visits (out-patient visits and hospitalisation) and the other covering people accessing social/support services. Individuals with ID (n = 15,289) were matched with a control population by sex, birth year, and year of first hospitalisation/out-patient visit/access to LSS services. Cause-of-death data were recorded using International Classification of Diseases, Tenth Revision. Cox proportional hazards regression were conducted to assess if overall and cause-specific mortality rate among individuals with ID was higher than in the Swedish population.

Results

The overall mortality rate among individuals with ID was 2483 per 100,000 people compared with 810 in the control population. Among those who died, more individuals with ID were younger than 75 years and unmarried. Leading causes of death among individuals with ID were circulatory diseases (34%), respiratory diseases (17%) and neoplasms (15%). Leading causes of death in a sub-sample with Down syndrome (DS) were respiratory diseases (37%), circulatory diseases (26%) and mental/behavioural disorders (11%). Epilepsy and pneumonitis were more common among individuals with ID than controls. Alzheimer’s disease was common in the control population and individuals with DS, but not among those with ID when DS was excluded. Individuals with ID had a higher overall mortality risk (hazard ratio [HR] 4.1, 95% confidence interval [CI] 4.0–4.3) and respiratory disease death risk (HR 12.5, 95% CI 10.9–14.2) than controls.

Conclusion

Older adults with ID in Sweden carry a higher mortality risk compared with the general population, mainly attributable to respiratory, nervous and circulatory diseases. Care for this group, particularly during the terminal stage of illness, needs to be tailored based on understanding of their main health problem.

Electronic supplementary material

The online version of this article (10.1186/s12877-017-0665-3) contains supplementary material, which is available to authorized users.

Unmet Needs of Adults in Community Mental Health Care With and Without Intellectual and Developmental Disabilities: A Cross-Sectional Study

The cross-sectional study compared the clinical and need profiles for clients with and without intellectual and developmental disabilities (IDD) in seven mental health case management programs in Toronto, Canada on March 31, 2013. Unmet needs in domains within four broad clusters were measured by staff using an internationally utilized tool, the Camberwell Assessment of Need. Among the 2560 clients, 8.3 % had a co-occurring IDD. For most assessed domains rates of unmet need were not different for persons with and without IDD. However, the IDD group had greater unmet needs for adaptive functioning/skills and cognitive needs [self-care (p = 0.023), education (p < 0.001), transportation (p < 0.001), and information on condition (p = 0.038)]. While clients with IDD and psychiatric diagnoses often receive poor quality care, in the case management programs examined their rates of unmet need were similar to individuals without IDD across most assessed domains, including in the areas of addictions and physical health care.

An estimation of the prevalence of intellectual disabilities and its association with age in rural and urban populations in India

Background:

Intellectual disability (ID) is a global public health concern. Prevalence of ID and its association with age and other demographic factors is required for planning purposes in India.

Objective:

This study analyzed the age-adjusted prevalence of ID in rural and urban populations and its correlation with age in children and adults.

Materials and Methods:

Disability data published in the report (2002) of National Sample Survey Organization were analyzed, using Z-test to measure differences in age-adjusted prevalence. Spearman rho was calculated to determine strength and direction of the association, and regression analysis was used to predict prevalence rate, based on age in rural and urban population settings.

Results:

Overall, India has a prevalence of 10.5/1000 in ID. Urban population has slightly higher rate (11/1000) than rural (10.08/1000; P = 0.044). Age was found to be highly correlated with prevalence of ID in rural children (ϱ =0.981, P = 0.019) as well as in children (ϱ = −0.954, P = 0.000) and adults (ϱ = −0.957, P = 0.000) in urban population. The possibility of confounding or the existence of covariates for children in urban settings was noted.

Conclusion:

Results of this study match findings in other epidemiological studies. However, multistage, large-scale studies are recommended for investigating prevalence rates with different severity levels of ID.

The use of a frailty index to predict adverse health outcomes (falls, fractures, hospitalization, medication use, comorbid conditions) in people with intellectual disabilities

Frailty in older people can be seen as the increased likelihood of future negative health outcomes. Lifelong disabilities in people with intellectual disabilities (ID) may not only influence their frailty status but also the consequences. Here, we report the relation between frailty and adverse health outcomes in older people with ID (50 years and over). In a prospective population based study, frailty was measured at baseline with a frailty index in 982 older adults with ID (≥50 yr). Information on negative health outcomes (falls, fractures, hospitalization, increased medication use, and comorbid conditions) was collected at baseline and after a three-year follow-up period. Odds ratios or regression coefficients for negative health outcomes were estimated with the frailty index, adjusted for gender, age, level of ID, Down syndrome and baseline adverse health condition. The frailty index was related to an increased risk of higher medication use and several comorbid conditions, but not to falls, fractures and hospitalization. Frailty at baseline was related to negative health outcomes three years later in older people with ID, but to a lesser extent than found in the general population.

Prevalence of podiatric conditions seen in Special Olympics athletes: a comparison of USA data to an international population

BACKGROUND

Persons with intellectual disabilities frequently have podiatric conditions. Limited information exists on their prevalence in international cohorts of Special Olympics (SO) athletes. Findings from multiple United States (US) venues are compared to those from athletes screened at the 2011 Special Olympics World Summer Games in Athens, Greece (ATHENS).

METHODS

Data from Fit Feet screenings from 2096 ATHENS participants was compared to 7192 US participants.

RESULTS

Frequently noted in the ATHENS population were motion restriction in both the ankle and the first metatarsal phalangeal joint (1st MTPJ), pes planus, metatarsus adductus, brachymetatarsia, hallux abducto valgus (HAV), onychomycosis, onychocryptosis, and tinea pedis. ATHENS differed from the US cohort as HAV and restricted ankle joint and 1st MTPJ joint motion was less frequent. Significantly more tinea pedis, xerosis, and hyperhidrosis were present in the ATHENS population.

DISCUSSION/CONCLUSION

SO athletes have a higher prevalence of podiatric structural conditions compared to the general population, and some vary between ATHENS versus US. Less prevalent in ATHENS was HAV, and restricted motion in both the ankle and 1st MTPJ. This may reflect differences due to varied clinical observers. The higher rates of several dermatological conditions in ATHENS may reflect venue seasonal climate, or social factors.

Physical activity levels of adolescents with and without intellectual disabilities during physical education and recess

To compare physical activity levels in adolescents with and without intellectual disabilities during physical education and recess. Forty adolescents diagnosed with intellectual disabilities (inclusive classrooms, n=20; self-contained classrooms, n=20) and 40 age-matched typically developing peers (general classrooms) participated. All participants wore an Actigraph GT1M accelerometer for 5 consecutive weekdays during school hours. Three groups of adolescents were similarly active during physical education; however, adolescents with intellectual disabilities in self-contained classrooms were less active during recess than did the other two groups. In addition, they spent less percentage of time in moderate-to-vigorous physical activity during recess than did the typically developing adolescents. An inclusive, structured, and supportive environment promotes physical activity engagement in adolescents with intellectual disabilities.

Foot-to-shoe mismatch and rates of referral in Special Olympics athletes

BACKGROUND

Improperly fitted shoes are frequently seen in athletes participating in Special Olympics competitions. This foot-to-shoe mismatch may result in deformities as well as discomfort and reduced performance or injuries in competitions. A primary purpose for providing medical screenings is to identify conditions unknown and to promptly refer to an appropriate provider for evaluation and care. This study attempts to determine the prevalence of improperly fitted shoes and the rate of referral for Special Olympics athletes screened at Fit Feet venues.

METHODS

To evaluate the foot-to-shoe mismatch and rate of referral, 4,094 Fit Feet screenings of Special Olympics athletes participating in US competitions in 2005 to 2009 were analyzed. The participants were 58.5% male and 41.5% female, with a median age of 25.6 years. A power analysis and the χ(2) test were used. The athletes voluntarily underwent a foot screening that followed the standardized Special Olympics Fit Feet protocol. The Brannock Device for measuring feet was used to assess proper fit.

RESULTS

A proper fit was found in 58.56% of the athletes, with 28.60% wearing shoes too big and 12.84% wearing shoes too small. Unrelated to shoe fit, 20% of the athletes required referrals for professional follow-up based on abnormal clinical findings.

CONCLUSIONS

There is a significant (41.44%) mismatch of foot to shoe in Special Olympics athletes. The most common mismatch is a shoe too big, with a much smaller number of athletes having shoes too small. Awareness of this foot-to-shoe incompatibility may be useful for the development of shoes better designed for athletes with a foot structure not consistent with conventional shoes. Because 20% of the athletes required a referral for professional follow-up, Fit Feet examinations are important for identifying athletes with conditions that can be more readily evaluated and treated, thus improving the athletes' comfort and performance. Beyond knowing the rate of referral, future studies can determine the conditions or findings that necessitate a referral and the ultimate outcome of that referral.

The impact of living arrangements and deinstitutionalisation in the health status of persons with intellectual disability in Europe

BACKGROUND

Despite progress in the process of deinstitutionalisation, very little is known about the health conditions of people with intellectual disability (PWID) who live in large institutions and PWID living in small residential services, family homes or independent living within the community. Furthermore, there are no international comparison studies at European level of the health status and health risk factors of PWID living in fully staffed residential services with formal support and care compared with those living in unstaffed family homes or independent houses with no formal support.

METHODS

A total of 1269 persons with ID and/or their proxy respondents were recruited and face-to-face interviewed in 14 EU countries with the P15, a multinational assessment battery for collecting data on health indicators relevant to PWID. Participants were grouped according to their living arrangements, availability of formal support and stage of deinstitutionalisation.

RESULTS

Obesity and sedentary lifestyle along with a number of illnesses such as epilepsy, mental disorders, allergies or constipation were highly prevalent among PWID. A significantly higher presence of myocardial infarctions, chronic bronchitis, osteoporosis and gastric or duodenal ulcers was found among participants in countries considered to be at the early stage of deinstitutionalisation. Regardless of deinstitutionalisation stage, important deficits in variables related to such medical health promotion measures as vaccinations, cancer screenings and medical checks were found in family homes and independent living arrangements. Age, number of people living in the same home or number of places in residential services, presence of affective symptoms and obesity require further attention as they seem to be related to an increase in the number of illnesses suffered by PWID.

DISCUSSION

Particular illnesses were found to be highly prevalent in PWID. There were important differences between different living arrangements depending on the level of formal support available and the stage of deinstitutionalisation. PWID are in need of tailored primary health programs that guarantee their access to quality health and health promotion and the preventative health actions of vaccination programs, systematic health checks, specific screenings and nutritional controls. Extensive national health surveys and epidemiological studies of PWID in the EC member states are urgently needed in order to reduce increased morbidity rates among this population.

The role of staff in health promotion in community residences for people with intellectual disabilities: variation in views among managers and caregivers

Managers and caregivers in community residences for people with intellectual disabilities are expected both to promote residents' health and to support their autonomy. The aim of this article was to explore variation in views among managers and caregivers on the role of staff in health promotion. A qualitative study was conducted using semi-structured interviews with six managers and six caregivers. The analysis used a phenomenographic approach to categorize variation in views. We identified five qualitatively different main categories of roles staff play in health promotion: the parent, the manipulator, the coach, the educator and the libertarian. In addition lifestyle-related risk factors for ill-health and barriers to a healthy lifestyle were analysed and described using qualitative content analysis. The results highlight the ethical conflict that faces staff trying to support a healthy lifestyle as well as the autonomy of the residents.

Prevalence of podiatric conditions seen in Special Olympics athletes: Structural, biomechanical and dermatological findings

BACKGROUND

Podiatric conditions are frequently seen in persons with intellectual disabilities. Unfortunately, many are not detected or addressed. This study attempts to determine the prevalence of a variety of selected podiatric conditions in Special Olympics athletes and compare the findings to studies of a similarly matched general population.

METHODS

Screenings from 1580 Special Olympics athletes participating in a sampling of United States competitions in 2004-2006 were used for the analysis. The athletes voluntarily underwent a foot screening which followed the standardized Special Olympics Fit Feet protocol.

RESULTS

The most commonly identified conditions included overpronated gait, abducted gait, restriction in both the ankle and the first metatarsal phalangeal joint, pes planus, metatarsus adductus, brachymetatarsia, hallux abducto valgus, onychomycosis, onychocryptosis and tinea pedis.

DISCUSSION/CONCLUSION

The prevalence of all the structural conditions was notably higher than a similarly matched general population and both conditions and biomechanical/gait findings associated with ligamentous laxity like pes planus and hallux abducto valgus had especially high prevalence rates. Restricted motion in the ankle and first metatarsal phalangeal joint was surprising and may indicate some athletes have intellectual disabilities with contractures. The higher rates of dermatophyte related conditions may reflect increased exposure from the athletic competition environment, immunocompromise, issues with hygiene or both. Higher rates of onychocryptosis in the athletes may be due to ill fitting shoes and/or hygiene issues.

A population-based assessment of the health, functional status, and consequent family impact among children with Down syndrome

BACKGROUND

Many health conditions have been described in children with Down syndrome (DS). However, there are little comparative population-based data available.

OBJECTIVE/HYPOTHESES

We sought to examine the health impacts associated with DS and other disabling conditions in U.S. children included in the 2005-2006 National Survey of Children with Special Health Care Needs.

METHODS

We assessed numerous health and functional outcomes in children with DS and without DS but with (1) mental retardation/developmental delay(1) and another developmental disability associated with a high functional impact; (2) mental retardation/developmental delay but no co-occurring high-impact disability; (3) other special health care needs; and (4) no special health care needs (referent).

RESULTS

Children with DS and in all 3 special health care needs comparison groups had substantially more health and functional difficulties than did the referent sample. Overall, children with DS were fairly comparable to children in the other mental retardation/developmental delay groups on health indicators; however, young children with DS were more likely than young children in both "other mental retardation" groups to have difficulties with breathing/respiration and swallowing/digestion/metabolism. Children with both DS and mental retardation associated with another high-impact disability had the highest levels of functional difficulties, unmet health needs, and family financial impacts. Nearly 60% of families in both groups provided home health care; in over 40%, a family member stopped working because of the child's condition; and about 40% reported the child's condition caused financial problems.

CONCLUSIONS

Children with DS can have substantial health and functional difficulties, with numerous financial impacts on their families.

Impact of additional disabilities on adaptive behavior and support profiles for people with intellectual disabilities

Numerous researchers have reported a high incidence of additional disabilities coexisting with intellectual disabilities. Although an intuitive link can be made between the existence of multiple disabilities and greater need for support, little has been reported about this relationship. Using measures of adaptive functioning and support needs, we examined the extent to which adaptive and challenging behaviors and consequent support needs (including medical) were impacted by the presence and severity of additional disabilities for individuals with intellectual disabilities. Results show that adaptive behaviors and support needs were meaningfully related to the number and severity of additional disabilities present, whereas this was not so for challenging behaviors. Findings are discussed in terms of contemporary models of disability and functioning.

Health of children 3 to 17 years of age with Down syndrome in the 1997-2005 national health interview survey

OBJECTIVE

This study provides population-based estimates of recent medical conditions, concurrent developmental disorders, and health impact and utilization indicators for US children with and without Down syndrome.

METHODS

The sample included children 3 to 17 years of age in the 1997-2005 National Health Interview Survey Child Sample Core and specifically included 146 children with Down syndrome, 604 children with mental retardation but without Down syndrome, and 95 454 children without either condition reported. Developmental and medical conditions, health status, and service use were reported by parents or other knowledgeable caregivers.

RESULTS

After adjustment for demographic factors, children with Down syndrome had higher odds, compared with children without mental retardation, of recent food/digestive allergy, frequent diarrhea/colitis, > or =3 ear infections in the previous year, very recent head/chest cold, and developmental disabilities other than mental retardation. They had increased odds that approached significance for recent seizures, very recent stomach/intestinal illness, and asthma. They had substantially higher rates (threefold or higher, compared with children without mental retardation) for nearly all health impact and health and special education service use measures. Of note, >25% of children with Down syndrome needed help with personal care, regularly took prescription medications, had recently seen a medical specialist, and received physical therapy or related therapy. The comparison group with mental retardation without Down syndrome represented many children with multiple serious disabilities who also had high rates of medical conditions and high levels of health impact and service use.

CONCLUSION

These findings provide empirical, population-based data to inform guidelines for frequent monitoring and support for children with Down syndrome.

Prevalence of hypertension in adults with intellectual disability in the Netherlands

BACKGROUND

Literature on the prevalence of hypertension in people with intellectual disability (ID) is mostly based on file studies or on measurements limited to the age group below 50 years. We measured and calculated the prevalence of hypertension in adults with ID and studied the distribution of hypertension in relation to age, gender, diagnosis of Down's syndrome and level of ID.

METHODS

In an observational cross-sectional study, standardized blood pressure measurements were obtained from 258 randomly selected adult clients of three Dutch care providers for people with ID. Hypertension was defined as a mean systolic blood pressure above 140 mm Hg on repeated measurements.

RESULTS

The overall prevalence rate of hypertension was 17.4% (95% CI 12.28-22.46). This was comparable to the prevalence in the general Dutch population. No accurate blood pressure measurement could be performed in 28.4% of people with severe and profound ID owing to repetitive physical activity or resistance. Hypertension was significantly related to older age and absence of Down's syndrome; no correlation with gender or level of ID could be shown.

RECOMMENDATION

The risk factor hypertension should be detected and treated in the same manner as in the general population following national guidelines.

The relationship of dementia prevalence in older adults with intellectual disability (ID) to age and severity of ID

BACKGROUND

Previous research has shown that adults with intellectual disability (ID) may be more at risk of developing dementia in old age than expected. However, the effect of age and ID severity on dementia prevalence rates has never been reported. We investigated the predictions that older adults with ID should have high prevalence rates of dementia that differ between ID severity groups and that the age-associated risk should be shifted to a younger age relative to the general population.

METHOD

A two-staged epidemiological survey of 281 adults with ID without Down syndrome (DS) aged 60 years; participants who screened positive with a memory task, informant-reported change in function or with the Dementia Questionnaire for Persons with Mental Retardation (DMR) underwent a detailed assessment. Diagnoses were made by psychiatrists according to international criteria. Prevalence rates were compared with UK prevalence and European consensus rates using standardized morbidity ratios (SMRs).

RESULTS

Dementia was more common in this population (prevalence of 18.3%, SMR 2.77 in those aged 65 years). Prevalence rates did not differ between mild, moderate and severe ID groups. Age was a strong risk factor and was not influenced by sex or ID severity. As predicted, SMRs were higher for younger age groups compared to older age groups, indicating a relative shift in age-associated risk.

CONCLUSIONS

Criteria-defined dementia is 2-3 times more common in the ID population, with a shift in risk to younger age groups compared to the general population.