Age-Specific Diagnostic Panorama Among People With Intellectual Disabilities in Comparison With the General Population: A Longitudinal Register Study (IDcare).
People with ID carry heavier illness loads in most body systems, yet cancer is under-diagnosed—so screen harder, not less.
01Research in Context
What this study did
Sandberg et al. (2026) tracked every diagnosis given to people with intellectual disability across 20 years. They used national health registers to compare illness patterns by age against the general population.
The team counted new diagnoses for heart, lung, gut, skin, cancer, and other body systems. They split adults into age bands to see when risks jump.
What they found
Most illnesses rise faster in people with ID. High blood pressure, diabetes, and epilepsy show up earlier and more often.
Cancer bucks the trend. Total cancer diagnoses are lower, probably because screening is spotty, not because true risk is low.
How this fits with other research
Simpson et al. (2001) saw the same cancer puzzle: overall incidence matched the general rate, but gallbladder, thyroid, brain, and testicular cancers were extra common. Magnus adds age detail and shows the gap starts in mid-adulthood.
Mammarella et al. (2022) gives one reason for low counts. Their melanoma cases were thicker at discovery, proving late detection. The register gap is likely missed cancers, not fewer cancers.
Martin et al. (1997) and Williams (1997) already flagged high gut and sensory problems. Magnus confirms these trends hold outside residential homes and across an entire nation.
Why it matters
Build systematic health screens into every adult plan. Schedule thyroid, brain, and testicular checks earlier. Pair cancer screening with your regular dental, hearing, and vision reviews. Teach staff red-flag signs so they advocate when doctors shrug off symptoms.
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02At a glance
03Original abstract
BACKGROUND: People with intellectual disabilities (ID) are known to have a higher risk for a wide range of health conditions compared to the general population. However, there is little research comparing a more comprehensive range of diseases and conditions at different ages. Therefore, the aim of this study was to explore the overall age-specific diagnostic pattern among people with ID compared to the general population. METHOD: Of all people living in Skåne, the southernmost part of Sweden (n = 1 274 727), those with a diagnosis indicating ID (F70-F79 or Q90 according to ICD-10) and/or service and support for people with ID/Autism spectrum disorders (ASD) constituted the ID cohort (n = 14 716). After excluding those in the same family/household as someone in the ID cohort, the remaining people comprised the general population cohort (gPop; n = 1 226 955). The main outcome was diagnoses by body system (i.e., ICD-10 chapters) during 2014-2021. Differences between the cohorts were investigated using Poisson regression, thereby estimating relative risks for the ID cohort vs. the gPop cohort. RESULTS: Four different diagnostic patterns among people with ID compared to the general population were identified: (1) increased risks with an age-related decline (ICD-10 Chapters III, IV, V, VI, VII, VIII, IX, XI, XII and XIV), (2) increased risk for higher ages but overall similar risks at younger ages (Chapters I and X) and (3) similar or decreased risk across age groups (Chapters II and XIII). CONCLUSIONS: For most body systems, there was an increased risk of diagnosis for people with ID, although in some cases, it declined with age. Although there are some potential explanations for this age-related decline, further investigations are needed to understand the pathways behind this phenomenon. Cancer diagnoses stood out in that a decreased risk was found for the ID cohort. This needs further attention. One reason may be due to lower rates of cancer screening in this group. The need for screening interventions tailored for people with ID has been highlighted for at least two decades, but few seem to have been developed, tested or implemented, which means that such interventions are still urgently warranted.
Journal of intellectual disability research : JIDR, 2026 · doi:10.12688/hrbopenres.13326.3