Familial Occurrence of Type 1 Diabetes Mellitus in Korean Children and Adolescents: A Multicenter Study

In this multicenter Korean cohort, familial T1DM accounted for 3.4% of pediatric cases, which was lower than in Western populations. Subsequent-affected children exhibited milder metabolic decompensation at diagnosis than did index children, likely reflecting earlier recognition through family awareness and screening. These findings underscore the importance of early education and monitoring of at-risk relatives within affected families.