SLPOtherAmerican journal on intellectual and developmental disabilities2025

Which Score for What? Operationalizing Standardized Cognitive Test Performance for the Assessment of Change.

Cristan Farmer, Audrey Thurm, Tanvi Das and 15 others

PMID 40858311

WHAT IT FOUND

For tracking cognitive change in people with moderate-to-profound intellectual disability, use the Stanford-Binet change sensitive score, not IQ or developmental quotient.

IQ and developmental quotient scores can hide low ability and mix true change with age norms.

Key findings

01IQ and developmental quotient scores can hide very low ability and make change hard to interpret because floors remove information and a falling score can mean slower gains, stability, or loss.

02The analysis supported using the change sensitive score rather than norm-referenced scores for tracking change, because it showed a developmental pattern of faster gains in younger participants and plateauing in older participants.

03Age equivalent and developmental quotient should not be used as primary measures of change; age equivalent can still help translate the change sensitive score into familiar years.

STILL TO COME

How it was doneWhat they foundWhat it means for SLPs

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What it does not show

The analysis used only two rare genetic conditions, PTEN hamartoma tumour syndrome and tuberous sclerosis complex, and excluded the Phelan McDermid Syndrome cohort because only 24 of 101 participants could take the test. Many participants could not take the Stanford-Binet 5, and about half of those without a test were reported to lack sufficient ability, so the findings apply mainly to people who can complete the test. The work tested score types from one cognitive test, the Stanford-Binet 5, so it does not prove the same choice is best for every developmental test. All score types had some model-check problems, including floor effects, ceiling effects, or unusual positive errors, so the statistical conclusions are not free of limitation. The study did not compare treatments and did not ask patients or caregivers whether a score change mattered clinically. The data were from natural history studies, so the results are about measurement and interpretation, not about therapy outcomes.

Declared interests

The paper lists NIH intramural research support. No conflict-of-interest declaration is included in the supplied text.

The easy way to misread this

Do not read the finding that the change sensitive score was most appropriate as proof that it detects clinically meaningful cognitive change. This paper did not compare treatments or ask patients and caregivers whether changes mattered; it tested how different score types behave statistically.

Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →