Febrile Seizures and Subsequent Autism Spectrum Disorder: A Nationwide Population-Based Cohort Study

Area of Science:

• Neuroscience
• Developmental Pediatrics
• Genetics

Background:

• Autism spectrum disorder (ASD) is frequently associated with neurodevelopmental conditions.
• Febrile seizures (FS) are common in childhood and sometimes co-occur with ASD.
• The independent association between FS and ASD requires clarification, especially considering comorbidities.

Purpose of the Study:

• To determine if febrile seizures are an independent risk factor for autism spectrum disorder.
• To investigate the role of neurodevelopmental comorbidities in the relationship between FS and ASD.
• To examine seizure-related clinical characteristics in relation to ASD risk.

Main Methods:

• Nationwide population-based matched cohort study using Taiwan's National Health Insurance Research Database.
• Included 948 children with FS and 3804 controls, followed longitudinally for ASD diagnosis.
• Cox proportional hazards models assessed associations, controlling for ADHD, epilepsy, and Tourette syndrome/tic disorder.

Main Results:

• Out of 4752 children followed for over 10 years, 43 (0.9%) developed ASD.
• Febrile seizures were not independently associated with ASD in adjusted models.
• Attention-deficit/hyperactivity disorder (ADHD), epilepsy, and Tourette syndrome/tic disorder were strongly associated with ASD.

Conclusions:

• Febrile seizures are not independently associated with autism spectrum disorder.
• The apparent link between FS and ASD is largely explained by shared neurodevelopmental comorbidities.
• Developmental surveillance should focus on children with neurodevelopmental disorders, not solely on those with FS.