Interventions for adults with mild intellectual disabilities and mental ill-health: a systematic review.
Evidence for treating mental ill-health in adults with mild ID is still paper-thin—group CBT has the most support, but new EMDR data show promise for PTSD.
01Research in Context
What this study did
The authors hunted for any treatment that helps adults with mild intellectual disability who also have mental ill-health.
They screened every paper they could find and kept only the ones that tested an intervention and measured mental-health change.
In the end they had a small pile of mostly tiny studies; many lacked control groups or clear outcome numbers.
What they found
Almost nothing was solid.
The only approach with even a hint of support was group CBT, and that evidence was still shaky.
The team called the whole picture “sparse and inconclusive” and asked for real randomized trials.
How this fits with other research
Dai et al. (2023) narrowed the lens to CBT for anxiety in the same population and found nine small studies showing mild benefit.
Their positive signal lines up with Eussen et al. (2016), but because they looked only at anxiety and added newer trials, the 2023 paper is the successor you should cite today.
Versluis et al. (2025) took a different path: twice-daily EMDR for PTSD in mild-ID adults and saw most clients lose the diagnosis.
That single strong result does not contradict the 2016 review; it simply shows one trauma therapy can work when delivered intensively, while the broader mental-health field still lacks data.
Chiviacowsky et al. (2013) and Rana et al. (2024) found the same “thin evidence” story for tobacco, alcohol, and lifestyle interventions, confirming that adults with ID are chronically under-studied across every health domain.
Why it matters
If you serve adults with mild ID, you now know that group CBT is the least-shaky option for anxiety or depression, but you still need to add visuals, role-play, and small ratios.
Track your own data and share it; the field needs every scrap it can get before anyone can write solid practice guidelines.
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02At a glance
03Original abstract
BACKGROUND: People with intellectual disabilities have very high rates of mental ill health. Standard psychosocial interventions designed for the general population may not be accessible for people with mild intellectual disabilities, and drug usage tends to be modified - 'start low and go slow'. This systematic review aims to synthesise the evidence on psychological, pharmacological and electroconvulsive therapy (ECT) interventions for adults with mild intellectual disabilities and mental ill health. METHOD: PRISMA guidelines were followed. Medline, Embase, PsycINFO and CINAHL were searched, as was grey literature and reference lists of selected papers. Papers were selected based on pre-defined inclusion and exclusion criteria. A proportion of papers were double reviewed. Data was extracted using a structured table. STUDY REGISTRATION: PROSPERO 2015:CRD42015015218. RESULTS: Initially, 18 949 records were identified. Sixteen studies were finally selected for inclusion; seven on psychological therapies, two on group exercise, five on antipsychotics and two on antidepressants. They do not provide definitive evidence for effectiveness of psychosocial interventions, nor address whether starting low and going slow is wise, or causes sub-optimum therapy. CONCLUSIONS: There are few evidence-based interventions for people with mild intellectual disabilities and mental ill-health; existing literature is limited in quantity and quality. Group cognitive-behavioural therapies have some supporting evidence - however, further randomised control trials are required, with longer-term follow-up, and larger sample sizes.
Journal of intellectual disability research : JIDR, 2016 · doi:10.1111/jir.12285