Impacts of Sibling Relations on Sociality, Communication, and Autism Severity in Children with Autism Spectrum Disorder: A Retrospective Analysis.

Objective: This study investigated the differences in sociality, communication, and autism severity in children with autism spectrum disorder (ASD) according to the presence or absence of siblings, the number of siblings, the order of birth, and the sex of sibling.

Methods: We included 71 children with autism spectrum disorder who visited University Hospital as outpatients. We compared the communication and socialization scores using the Korean Version of the Vineland Adaptive Behavior Scale, second edition (K-VABS II); social interaction, communication, and language using the autism diagnostic interview-revised (ADI-R); and the total score of the Korean-Childhood Autism Rating Scale 2 (K-CARS 2) according to the presence or absence of siblings, the number of siblings, the order of birth and the sex of sibling.