Reliability and validity of the Pervasive Developmental Disorders Assessment System

Area of Science:

• Neuroscience
• Psychiatry
• Developmental Psychology

Background:

• Pervasive Developmental Disorders (PDD) require accurate diagnostic tools.
• Existing assessment systems may have limitations in specific cultural contexts.
• A reliable and valid Japanese semistructured interview system is needed.

Purpose of the Study:

• To evaluate the reliability and validity of the Pervasive Developmental Disorders Assessment System (PDDAS).
• To assess the PDDAS's utility in diagnosing PDD and its subtypes.
• To establish the PDDAS as a dependable tool for Japanese populations.

Main Methods:

• The PDDAS, a 91-item semistructured interview, was administered to mothers of children with and without PDD.
• The system includes items for DSM-IV autistic disorder criteria, autistic symptoms, Asperger's disorder screening, and developmental/family history.
• Data from 77 PDD children and 64 non-PDD children were analyzed.

Main Results:

• The PDDAS exhibited satisfactory interrater reliability across most items.
• Discriminant validity was demonstrated, with significant differences between PDD and non-PDD groups.
• PDDAS diagnoses showed high agreement with consensus DSM-IV diagnoses for PDD, with minor discrepancies in subtype classification.

Conclusions:

• The PDDAS is a reliable and valid tool for diagnosing PDD and its subtypes.
• The system has demonstrated clinical and research utility, despite requiring further investigation.
• The PDDAS offers a valuable assessment resource for Japanese children with PDD.