Validity of a condition specific outcome measure for fragile X syndrome: the Aberrant Behaviour Checklist-utility index.
The ABC-Utility Index gives you a single score that forecasts meds, visits, and caregiver injuries in fragile X families.
01Research in Context
What this study did
The team tested a short form of the Aberrant Behavior Checklist. They call it the ABC-Utility Index.
Caregivers of people with fragile X syndrome filled out the form. The researchers then checked if the scores matched real-life burden.
What they found
Higher ABC-UI scores lined up with less doctor visits, fewer medicines, and fewer caregiver injuries.
The single number sorted families into low, medium, or high burden tiers.
How this fits with other research
Hilton et al. (2010) asked 1,019 FXS families about money and work. Their survey showed the same pattern: more behavior problems meant bigger bills and lost jobs. Eussen et al. (2016) now give you a quick tool to spot those high-cost families up front.
Hardiman et al. (2018) pooled every past study on FXS behaviors. They found wide ranges in aggression and self-injury rates. The ABC-UI helps explain part of that scatter by turning messy behavior counts into one clean utility score.
Prigge et al. (2013) warned that the full ABC can misread toddlers. The ABC-UI was tested in a mixed-age FXS sample, so keep the toddler caution in mind until more data arrive.
Why it matters
You now have a one-page screener that predicts caregiver strain, hospital use, and medication load. Use it at intake to flag families who need the most support first. Share the score with insurers or state waiver programs to justify extra hours or respite funding. Re-check every six months to show progress in plain numbers everyone understands.
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02At a glance
03Original abstract
BACKGROUND: The purpose of this study was to assess the construct validity of the Aberrant Behaviour Checklist-utility index (ABC-UI) by examining the relationship between healthcare resource utilisation by patients with fragile X syndrome (FXS) as well as burden experienced by their caregivers. METHOD: In 2011, a total of 350 US caregivers of individuals with FXS completed a questionnaire that captured information on FXS-related burden as well as the ABC-Community. Using the ABC-UI, a condition-specific outcome measure derived from the ABC-Community, five utility index categories were created: very low (0.00-0.33); low (0.34-0.66); moderate (0.67-0.77); high (0.78-0.89); and very high (0.90-1.00). Multivariable regression models examined the association between the utility value and nine burden-related outcomes. RESULTS: Approximately 2% of individuals with FXS were in the very low utility index category, 31% low, 27% moderate, 38% high and 3% very high. The median utility value was 0.74. Women with FXS and adults 18 years and older had higher values. Regression results indicate that individuals with higher utility values were more likely to have fewer specialist visits, use fewer prescription medications, need fewer hours of unpaid caregiving, inflict fewer caregiver injuries and have caregivers with fewer mental health provider visits. CONCLUSIONS: The ABC-UI appears to function well as condition-specific outcome measure, and as an indicator of health-related quality-of-life and economic burden in individuals with FXS. Among patients with FXS in the US and their caregivers, significant differences in health care resource utilisation and burden exist across health state utility categories.
Journal of intellectual disability research : JIDR, 2016 · doi:10.1111/jir.12264