Adult psychiatric and psychosocial outcomes of children with mild intellectual disability: a register follow-up of a population-based cohort.
Over half of adults with mild ID have a psychiatric diagnosis and most struggle to find work—so behavior plans must include lifelong mental-health and vocational supports.
01Research in Context
What this study did
Swedish researchers followed the kids with mild intellectual disability for 20 years. They used national registers to track jobs, crimes, school, and mental-health care.
The team wanted a full picture of adult life, not just one outcome. They counted anyone who had a psychiatric diagnosis, a criminal record, regular-school graduation, or paid work.
What they found
By age 30, only a large share had ever held a job and only a large share finished regular high school. More than half—a large share—had at least one psychiatric diagnosis and a large share had a criminal conviction.
The numbers show wide scatter: some adults live independently and work, others need daily support. Mental-health care was the common thread.
How this fits with other research
Horovitz et al. (2014) already showed that each extra Axis-I diagnosis lowers quality of life in adults with ID. V et al. now give the population size of that burden: more than one in two carry a diagnosis.
Austin et al. (2015) found that affectionate ties—not network size—drive happiness in mild-ID adults. The Swedish data add the flip side: without those ties and without jobs, psychiatric risk soars.
Chen et al. (2011) traced early school problems to later crime in students with learning or emotional disabilities. V et al. mirror this: a large share of the mild-ID group entered the justice system, hinting that similar early warning signs apply.
Why it matters
For BCBAs, the takeaway is clear—intervention must plan for lifelong mental-health risk. Build robust self-advocacy, vocational, and coping skills before transition. Schedule regular check-ins with community mental-health teams and document any life events like moves, bereavement, or job loss. Your behavior plan is part of a bigger safety net.
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02At a glance
03Original abstract
BACKGROUND: Very few longitudinal psychiatric and psychosocial outcome studies of children with mild intellectual disability (MID) have been performed. METHODS: The study group was population based and consisted of 82 individuals, born in 1979-1985 and diagnosed in childhood at ages between 3 and 15 years with MID. In the present study, register data regarding school attendance, employment, economic situation, psychiatric diagnoses and criminal sentences were retrieved for the years 1997-2018, when the individuals were up to 39 years old. RESULTS: At follow-up, data were obtained for 78 of the 82 individuals (47 male and 31 female). Mean age at follow-up was 36 years. Of the 78 individuals, 57 (73%) had exclusively received education for pupils with MID, but 21 (27%) had graduated from regular education of some sort (at least 9 years). Forty-four (56%) had never been employed, and 34 (44%) had been registered as employed for at least a shorter period. Forty-seven (60%) had received a sick pension at some point in adulthood. Of the 78 individuals, 44 (56%) had any psychiatric disorder recorded and about half of these (n = 21) had had inpatient treatment. A total of 31 of the 44 individuals in psychiatric care (70%) had ID noted as one of their diagnoses. Of the 78 individuals, 48 (62%) had support from the Act concerning Support and Service for Persons with Certain Functional Impairments (Swedish LSS law) as adults. Twenty-one individuals (27%) had had a criminal conviction, of whom five male individuals had been incarcerated. CONCLUSIONS: Individuals with MID constitute a heterogeneous group with regard to severity of functional impairment, co-occurring psychiatric disorders and need of support from society. Primary health care, psychiatry and habilitation services need to work together in order to meet the multiple needs of this group.
Journal of intellectual disability research : JIDR, 2024 · doi:10.1111/jir.13087