Clinical correlates of diagnostic certainty in children and youths with Autistic Disorder.
Eya-Mist Rødgaard, Borja Rodríguez-Herreros, Abderrahim Zeribi and 7 others
PMID 38570867WHAT IT FOUND
Clinicians were most certain of an Autistic Disorder diagnosis when specific social and communication signs were present, not just when total symptom scores were high.
Larger head circumference was also linked to higher certainty, suggesting physical traits may influence diagnostic confidence.
Key findings
01Diagnostic certainty correlated only modestly with total autism symptom severity, meaning some children with low scores were diagnosed with highest certainty and vice versa.
02Specific ADOS items, particularly in social interaction and communication domains, were more strongly associated with highest diagnostic certainty than others.
03Normalized head circumference was significantly larger in individuals diagnosed with the highest certainty across all language levels.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study focused exclusively on individuals diagnosed with Autistic Disorder (DSM-IV), so findings do not generalize to the broader autism spectrum (e.g., Asperger's or PDD-NOS). Diagnostic certainty ratings were highly skewed, with most participants receiving the maximum score, which may have made it difficult to detect subtle associations. The sample was not representative of the general population, with high parental education levels and low racial/ethnic diversity, potentially introducing selection bias. Certainty is a subjective measure influenced by individual clinician experience and implicit knowledge, so results represent an average pattern rather than a universal rule. The study was exploratory and cross-sectional, so it cannot determine causality or how these factors influence diagnostic outcomes over time.
Declared interests
The study used data from the Simons Simplex Collection, which is supported by the Simons Foundation Autism Research Initiative. Publication types indicate non-U.S. government support.
The easy way to misread this
Do not assume that a high total symptom score automatically leads to a high-certainty diagnosis, or that a low score rules out autism. The study found that specific qualitative signs and physical traits like head circumference influenced clinician certainty more than overall symptom load. A child with fewer symptoms but specific social or communication markers may still be diagnosed with high certainty.