Behavior problems, psychiatric symptoms, and quality of life for older adults with intellectual disability with and without autism.

The team looked at 50-plus-year-old adults who all had intellectual disability. Half also had autism.

They counted behavior problems, psychiatric symptoms, and quality-of-life scores. Then they asked, 'Does autism add extra trouble once daily-living skills are held constant?'

No. After matching groups on adaptive skills, the autism-plus-ID adults looked the same as ID-only adults on every measure.

In plain words, lower daily-living skills—not the autism label—drove the problems.

Prigge et al. (2013) extends this idea. They show that when both low adaptive skills and the full autism triad are present, challenging behavior jumps even higher. The two studies together say: check skills first, then check for the triad.

Yamashiro et al. (2019) seems to disagree. They found adults with ASD in disability services carry more psychotropic prescriptions than peers without ASD. The clash disappears when you see their sample was younger and pulled from service clinics where meds are handed out quickly. Vasiliki’s older, community-based sample avoided that bias.

Mahé et al. (2025) updates the picture. Their 2025 data say epilepsy plus severe externalizing behavior, not autism per se, best predicts polypharmacy. This supersedes the simple ‘ASD equals more meds’ story.

Stop blaming autism for extra behavior or pill use in older adults. Screen adaptive skills first. If skills are low, teach daily living tasks before adding another med or restraint. When you see high drug loads, look for epilepsy or externalizing behavior—those are the real red flags.