Comorbidity of Atopic Disorders with Autism Spectrum Disorder and Attention Deficit/Hyperactivity Disorder

Area of Science:

• Pediatric Allergy and Immunology
• Neurodevelopmental Disorders Research
• Public Health and Epidemiology

Background:

• Allergic manifestations in early life are common.
• Autism spectrum disorder (ASD) and attention deficit/hyperactivity disorder (ADHD) are significant neurodevelopmental conditions.
• The potential link between early-life allergies and later neurodevelopmental diagnoses requires investigation.

Purpose of the Study:

• To investigate the association between early-life allergic manifestations, specifically atopic dermatitis (AD), and the subsequent diagnosis of ASD and ADHD.
• To quantify the risk of ASD and ADHD in children with a history of early-onset AD.

Main Methods:

• A population-based longitudinal cohort study was conducted using data from Taiwan's National Health Insurance Program (2000-2010).
• 387,262 children diagnosed with atopic dermatitis (AD) before age 2 were identified and matched 1:1 with controls without AD.
• Cox regression analyses were employed to assess the relationship between allergic manifestations and ASD/ADHD diagnoses.

Main Results:

• Children with AD before age 2 had higher incidence rates of ASD (0.5% vs 0.4%) and ADHD (3.7% vs 2.9%) compared to non-exposed peers.
• Early-onset AD was associated with a 10% increased hazard ratio (HR) for ASD and a 16% increased HR for ADHD.
• Persistent AD and co-occurring atopic respiratory diseases in childhood showed particularly elevated HRs for ASD (adjusted HR, 1.75-2.13).

Conclusions:

• Infantile atopic dermatitis is associated with increased risks for developing ASD and ADHD.
• These findings suggest that dysregulated immune responses in early life may influence neurodevelopmental trajectories.
• The results have implications for understanding the etiology of ASD and ADHD and for developing novel treatment strategies.