Expressive Language Sample Concordance With ADOS-2 Scores: Autism, Down Syndrome, Fragile X Syndrome.
Hannah Barton, Sara Kover, Angela John Thurman and 7 others
PMID 42584862WHAT IT FOUND
The ADOS-2 EL score (1–8) reflects a person's spoken syntax and vocabulary, but it did not change over a year while traditional language-sample measures did.
Use it as a snapshot, not a progress tracker.
Key findings
01The EL score was significantly predicted by syntactic complexity (MLUm) in both the narration and ADOS-2 contexts, and by lexical diversity (NDW) in the conversation context, confirming it captures spoken language mastery.
02Total utterances during conversation was a negative predictor of EL score, and neither diagnostic group (DS, FXS vs. autism) nor autism severity (ADOS-2 comparison score) predicted the EL score in any model.
03Over one year, MLUm increased significantly in all three sampling contexts, but the EL score did not change significantly (p = 0.128), indicating it is not sensitive to language growth.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The Down syndrome (n = 20) and Fragile X (n = 21) groups are small, so findings for those populations carry less weight than for the autism group. Inclusion required phrase-level speech (at least occasional three-word utterances), so the results do not apply to non-speaking or single-word users. Only 70 of the 76 autistic participants completed the one-year follow-up; six were lost to incomplete transcripts or non-return. Transcriber training agreement was 70%, which is modest for a study whose entire analysis depends on transcript accuracy. Single-site study; the interaction was with an unfamiliar, neurotypical examiner, which may not reflect a patient's communication in familiar settings.
Declared interests
No funding source or conflict-of-interest statement appears in the provided text.
The easy way to misread this
Do not use the EL score to track a patient's language progress over time. In this study, MLUm increased significantly over one year in all three contexts, yet the EL score did not change significantly (p = 0.128). A clinician who re-administers the ADOS-2 and sees the same EL score cannot conclude the patient's language has not improved; the score simply lacks the resolution to detect it.