Autism & Developmental

Functional skills of individuals with fragile x syndrome: a lifespan cross-sectional analysis.

Bailey et al. (2009) · American journal on intellectual and developmental disabilities 2009
★ The Verdict

Daily living skills look good in fragile X adults, but complex language and reading still need heavy teaching.

✓ Read this if BCBAs writing transition or adult plans for clients with fragile X.
✗ Skip if Clinicians serving only ASD or early-childhood cases.

01Research in Context

01

What this study did

Parents across the U.S. answered questions about daily skills in sons and daughters with fragile X. The survey covered dressing, cooking, reading, and talking. Ages ranged from toddlers to seniors, giving a life-span snapshot.

02

What they found

Most adults with fragile X can shower, dress, and feed themselves. Complex speech and reading stay weak. Males lag behind females in every area.

03

How this fits with other research

Matson et al. (2011) used the same parent list and showed daily skills predict independence in men, while social skills predict it in women.

Scott et al. (2018) found the same daily skills forecast paid work and living on your own in 534 males with fragile X.

Hoyle et al. (2022) explains why talking stays hard: language ability, not IQ or autism symptoms, drives how complex a story a teen can tell.

Klusek et al. (2015) zoomed in on reading and showed phonological awareness, not mental age, predicts how well boys read.

04

Why it matters

You can stop guessing what to teach next. Focus intervention blocks on real-life language and phonics, not just labels or flash cards. Add self-care goals for everyone, but write heavier language objectives for males. Track these targets into adulthood; the survey shows they still matter after 21.

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Add one phonological-awareness task and one story-retell with wh-questions to this week's sessions.

02At a glance

Intervention
not applicable
Design
survey
Sample size
1388
Population
developmental delay
Finding
mixed

03Original abstract

Parents of 1,105 male and 283 female children with fragile X syndrome described functional skill attainment in eating, dressing, toileting, bathing/hygiene, communication, articulation, and reading. The majority of adult children had mastered many skills independently. Most adults were verbal, used the toilet, dressed, ate independently, bathed, and used a towel independently. However, some skills were not as well-developed, such as using complex sentences, reading, or speaking at a typical rate. As expected, significant differences were found between males and females. The findings highlight major skill attainments, identify skills that should be the target of specific intervention programs, suggest variable trajectories to be tested more precisely through direct assessments and longitudinally, and provide baseline data for treatment studies.

American journal on intellectual and developmental disabilities, 2009 · doi:10.1352/1944-7558-114.4.289-303