Validating the Learning Disability Screening Questionnaire Against the Weschler Adult Intelligence Scale, Fourth Edition.
The short LDSQ still flags adult ID accurately against the newest WAIS-IV—no score tweaks needed.
01Research in Context
What this study did
The team gave the adults with ID two tests. One was the short Learning Disability Screening Questionnaire (LDSQ). The other was the long WAIS-IV IQ test.
They wanted to see if the quick LDSQ could still flag true ID now that the WAIS has a new edition.
What they found
The brief LDSQ caught 91 out of 100 people who truly had ID. It also correctly ruled in 92 out of 100 who did not.
The old cut-off score still worked. No need to raise or lower the bar.
How this fits with other research
Willner (2008) showed that changing question format can halve measured suggestibility in the same population. Together the papers warn us: small test changes swing scores, so pick the right tool for the right job.
Chiviacowsky et al. (2013) compared two behavior checklists and found weak item-level agreement. Karen et al. avoided that pitfall by linking the LDSQ to a gold-standard IQ test, giving stronger footing for diagnosis.
Lerman et al. (1995) likewise proved their sexual-knowledge interview was reliable. Karen’s team follows that playbook, supplying fresh validity evidence so clinicians can trust brief screens instead of long batteries.
Why it matters
You can keep using the LDSQ in intake meetings. A five-minute screen now matches the long WAIS-IV result 9 times out of 10. That frees clinic time for treatment, not more testing.
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02At a glance
03Original abstract
The Learning Disability Screening Questionnaire (LDSQ), a brief screening tool for intellectual disability, was originally validated against the Weschler Adult Intelligence Scale, Third Edition (WAIS-III), which was superseded by the Weschler Adult Intelligence Scale, Fourth Edition (WAIS-IV) in the United Kingdom in 2010. This study examines the performance of the LDSQ using the WAIS-IV as the diagnostic intellectual assessment. Based on the original optimal cut-off score, the LDSQ sensitivity value was equivalent (91%) to that obtained in the original validation study, and the specificity value was higher at 92%. This suggests that the LDSQ remains valid when using the WAIS-IV as the comparative intellectual assessment.
Intellectual and developmental disabilities, 2015 · doi:10.1352/1934-9556-53.4.301