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The pre-linguistic autism diagnostic observation schedule
P C DiLavore1, C Lord, M Rutter
1University of Chicago, Illinois 60637, USA.
Insights
The Pre-Linguistic Autism Diagnostic Observation Schedule (PL-ADOS) offers a reliable method for diagnosing autism in nonverbal children under six. This playful, toy-based assessment effectively distinguishes autistic from non-autistic children.
Area of Science:
- Developmental Psychology
- Pediatric Psychiatry
- Autism Spectrum Disorder Research
Background:
- Autism Spectrum Disorder (ASD) diagnosis in very young children, particularly those not yet using phrase speech, presents unique challenges.
- Existing diagnostic tools may not be suitable for pre-linguistic or minimally verbal children under six years old.
- Accurate and early diagnosis is crucial for timely intervention and support for children with ASD.
Purpose of the Study:
- To introduce and evaluate the Pre-Linguistic Autism Diagnostic Observation Schedule (PL-ADOS) as a diagnostic tool for children under six suspected of having autism.
- To assess the reliability and validity of the PL-ADOS in differentiating autistic from non-autistic children within this specific age group.
- To provide a structured, play-based assessment method tailored for pre-linguistic children.
Main Methods:
- The PL-ADOS is a semi-structured observation scale utilizing playful interactions and age-appropriate toys.
- Administration time is approximately 30 minutes.
- Reliability was assessed using naive raters scoring videotaped assessments for individual and summary ratings.
- Diagnostic validity was examined by comparing PL-ADOS scores with clinical judgments of a diagnostic team for referred nonverbal preschool-aged children.
Main Results:
- Reliability studies demonstrated that both individual activity and summary ratings could be reliably scored from videotaped assessments by naive raters.
- PL-ADOS scores effectively discriminated between autistic and non-autistic developmentally disabled children among nonverbal preschool-aged children.
- The diagnostic algorithm derived from PL-ADOS is theoretically aligned with ICD-10 and DSM-IV diagnostic criteria for autism.
Conclusions:
- The PL-ADOS is a reliable and valid diagnostic tool for assessing autism in pre-linguistic children under six years old.
- Its play-based approach and focus on interaction make it suitable for this young and vulnerable population.
- The PL-ADOS provides a valuable instrument for early identification and diagnosis of ASD in nonverbal children, supporting timely intervention.
Abstract:
The Pre-Linguistic Autism Diagnostic Observation Schedule (PL-ADOS) is a semistructured observation scale designed for use as a diagnostic tool for children less than 6 years old who are not yet using phrase speech and are suspected of having autism. The PL-ADOS takes approximately 30 minutes to administer and is appropriate for use with this population because of its emphasis on playful interactions and the use of toys designed for young children. Reliability studies indicated that both individual activity ratings and summary ratings could be reliably scored from videotaped assessments by naive raters. Additionally, PL-ADOS scores of nonverbal preschool-aged children referred for clinical diagnosis and classified on the basis of a diagnostic team's clinical judgment, clearly discriminated between autistic and nonautistic developmentally disabled children. The resulting diagnostic algorithm is theoretically linked to diagnostic constructs associated with ICD-10 and DSM-IV criteria for autism.