Adults with intellectual disability have substantially worse health outcomes and shorter life expectancy than people without intellectual disability. Within this population, those with severe or profound intellectual disability have particularly complex health needs but had not previously been examined in a large-scale, population-based mortality study. The authors aimed to characterise causes of death, prevalence of comorbid conditions, avoidable mortality, and determinants of age at death in this high-need group, using national datasets from England.
The study used mortality data from the Learning from Lives and Deaths (LeDeR) mortality review programme linked with comparator data from the Office for National Statistics (ONS) covering deaths between 2021 and 2023. The authors included only decedents and extracted sociodemographic, clinical, and mortality information. Avoidable deaths were adjudicated by mapping underlying causes of death to the Organisation for Economic Co-operation and Development (OECD) list of avoidable causes and defined as deaths before age 75 due to preventable or treatable causes.
The analysed sample comprised three groups: 1,301 adults with severe or profound intellectual disability, 2,626 adults with mild or moderate intellectual disability, and 536,311 adults from the general population who died over the same period. Adults with severe or profound intellectual disability had notably higher prevalences of several co-occurring conditions compared with those with milder intellectual disability. Reported prevalences in the severe/profound group included dysphagia (63.0%), epilepsy (36.1%), and visual problems (35.9%). All reported differences versus the mild/moderate group were statistically significant (p < 0.01).
Median age at death differed substantially by group. Adults with severe or profound intellectual disability died at a median age of 57.9 years, those with mild or moderate intellectual disability at 65.0 years, and the general population at 81.9 years. These differences were statistically significant (p < 0.001) and reflect a marked reduction in life expectancy associated with intellectual disability severity.
Among adults with severe or profound intellectual disability, 39.5% of deaths were classified as avoidable deaths—that is, deaths occurring before age 75 from causes considered preventable or treatable per the OECD list. The avoidable deaths in this group resulted in 15,059.4 years of life lost. The authors highlight that two-thirds of avoidable deaths in this population were attributable to treatable conditions, particularly pneumonia and epilepsy, indicating potential opportunities to reduce premature mortality through improved clinical care and public health measures.
The investigators used Cox regression and multiple linear regression to examine factors associated with age at death. In adjusted analyses, severe or profound intellectual disability was associated with a younger age at death, with an adjusted mean difference of −7.17 years (95% confidence interval −8.16 to −6.18; p < 0.001) relative to comparison groups. The dataset and analytic approach allow identification of factors correlated with earlier age at death among decedents but do not provide direct estimates of population-level mortality risk.
The study identifies a high burden of comorbidity and a large proportion of potentially preventable or treatable deaths among adults with severe or profound intellectual disability. The prominence of pneumonia and epilepsy among avoidable causes suggests that timely management of infections, aspiration risk reduction, vaccination, seizure control, and access to routine health interventions (for example, annual health checks and vaccination programmes) may reduce avoidable mortality. The authors emphasise the need for tailored public health strategies, earlier interventions, and integrated care models that actively ensure access to key interventions for this population, with attention to ethnic minority groups who may face compounded disadvantages.
Strengths of the study include the use of national LeDeR data specifically collected for people with intellectual disability and the large sample of decedents allowing detailed description of comorbidities, causes of death, and avoidable mortality. A key limitation is that the cohort comprises only people who died; therefore the findings describe factors associated with age at death among decedents but cannot determine who in the living population is most likely to experience premature death. The source also notes that individual-level LeDeR data cannot be publicly released due to information governance restrictions; aggregated tables and supporting information are provided in the manuscript.
Adults with severe or profound intellectual disability in England die substantially younger than people with milder intellectual disability and than the general population. A large fraction of deaths in this group are classified as avoidable, largely from treatable conditions such as pneumonia and epilepsy, accounting for substantial years of life lost. The authors call for targeted public health actions, improved access to timely healthcare interventions, and integrated care pathways to address these disparities and reduce premature, preventable deaths in this vulnerable population.