B - 22 Self-Reported Traumatic Brain Injury and its Biopsychosocial Risk Factors in Siblings of Individuals with Neurodevelopmental Conditions.

This article focuses on self-reported traumatic brain injury (TBI) and its biopsychosocial risk factors among siblings of individuals with neurodevelopmental conditions (NDCs). Using data from an online survey of 632 siblings (207 with NDCs and 425 controls), the study found that siblings of individuals with NDCs reported a higher lifetime prevalence of TBI, often with multiple injuries and at younger ages. TBI history in these siblings was linked to psychiatric diagnoses and subclinical NDC traits such as hyperactivity, impulsivity, inattention, conduct problems, and autistic traits. Additionally, family and structural factors associated with TBI included poorer parent–child relationships, specific NDC diagnoses (autism or fetal alcohol spectrum disorder), minority ethnicity, and lower income. The findings highlight the need for targeted health literacy, TBI education, screening, prevention, intervention strategies, and family support addressing social and structural determinants affecting the wellbeing of NDC siblings.