Differentiating Autism Spectrum Disorder From ADHD Using the Social Communication Questionnaire

Area of Science:

• Child and Adolescent Psychiatry
• Neurodevelopmental Disorders
• Psychometric Assessment

Background:

• Autism Spectrum Disorder (ASD) and Attention-Deficit/Hyperactivity Disorder (ADHD) are common neurodevelopmental conditions.
• Differentiating between ASD and ADHD is crucial for appropriate diagnosis and intervention.
• The Social Communication Questionnaire (SCQ) is a widely used screening tool, but its efficacy in distinguishing between these conditions requires further investigation.

Purpose of the Study:

• To evaluate the Social Communication Questionnaire's (SCQ) ability to differentiate between children with autism spectrum disorder (ASD), ADHD, and typically developing (TD) children.
• To identify optimal SCQ score cutoffs for distinguishing ASD from ADHD.
• To determine the specific SCQ items most effective in differentiating between ASD and ADHD.

Main Methods:

• A cross-sectional study involving children diagnosed with ASD (Severity Levels 1-2), ADHD, comorbid ADHD and ASD, and TD controls.
• All participants (N=162) were assessed using the Social Communication Questionnaire (SCQ).
• Statistical analyses were performed to compare SCQ scores across groups and identify differentiating items and optimal cutoffs.

Main Results:

• The SCQ demonstrated significant differentiation between ASD and non-ASD groups.
• Children with ASD exhibited higher total and domain scores on the SCQ compared to children with ADHD and TD children.
• An optimal total score cutoff of 13 on the SCQ was identified for differentiating between ASD and ADHD groups with high accuracy (AUC = .96).
• Twenty-eight out of 39 SCQ items were found to be significant in distinguishing between ASD and ADHD.

Conclusions:

• The Social Communication Questionnaire (SCQ) is a well-validated and effective screening tool for identifying potential cases of ASD.
• The SCQ is particularly useful for determining the need for further ASD assessment in children presenting with ADHD symptoms.
• The findings support the continued use of the SCQ in clinical settings for differentiating neurodevelopmental disorders in children.