Activity limitations among young adults with developmental disabilities: a population-based follow-up study.

Van Naarden Braun et al. (2009) tracked a whole population of young adults with developmental disabilities. They wanted to know who still had big trouble with everyday activities at age 18-25.

The team looked back at records and checked how severe each person's delays were. They counted how many body systems were involved and how much support each person needed.

Only the young adults with severe intellectual disability or several impairments showed serious activity limits. Those with just one isolated delay usually managed fine.

In short, mild or single problems rarely block independence. Big support needs cluster in the same people who have both severe ID and extra medical or sensory issues.

Van Naarden Braun et al. (2006) used a survey and saw the same pattern earlier: activity limits, not the diagnosis itself, predict leisure gaps. The 2009 follow-up confirms the signal with stronger population data.

Lin et al. (2013) and Amore et al. (2011) moved the question to mid-life and older adults. They still find that severe ID predicts more ADL trouble, but they add that mobility problems overtake ID level with age. The core message—target the severe, multi-impairment group—holds across age bands.

Taylor et al. (2012) show the flip side: 13% of adults with IDD have no daytime activities at all. Kim's work explains why—those idle adults are likely the same severe, multi-impairment group that needs the most creative programming.

Stop assuming every young adult with a developmental diagnosis needs heavy support. Use brief screenings to spot severe ID plus extra impairments; pour your resources there. For clients with mild or single delays, shift goals toward college, jobs, and community leisure rather than daily-living drills. This focus saves hours and funding while still protecting the ones who truly need intensive help.