Korea's first multicentre study finds type 1 diabetes in 23 of 779 patients' siblings

The sibling figure works out to one case per 34 siblings tested ^[14]. At the 0.26% the study cites for the general pediatric population, finding one case takes about 385 children ^[15], so the gap in hit rates is roughly eleven to one ^[16]. The released findings do not include a price for an autoantibody panel or the ketoacidosis rates behind the clinical comparison ^[24].

The two percentages are not the same kind of quantity. The 3.0% is the share of siblings who had developed the disease in a cohort built from diagnoses spread across 2010 to 2024 ^[2][6]. The 0.26% is described as an incidence rate in the general pediatric population ^[7]. Cumulative occurrence measured once, divided by an annual rate, is not a like-for-like division. If the 0.26% is itself a cumulative childhood figure, the ratio holds and this objection is empty.

The twin result is the thinnest number here. Three of seven pairs were concordant, reported as 42.9% ^[8]. An eighth pair would move that to 37.5% or 50%, depending which way it fell ^[18]. The published counts also have a small wrinkle. About ten of the 936 patients had an affected parent, on the 1.1% figure ^[5], and ten plus 23 affected siblings comes to 33 against a family-history total of 32 ^[4][6][21]. Households with more than one affected relative would account for it.

The result that could pay for a programme is the earlier-stage presentation, and its base is small. Second-diagnosed patients are a subset of the 32 with a family history, so at most 32 children carry that comparison ^[4][22]. The researchers said greater awareness of the disease following an earlier diagnosis in the family may have led to relatively early detection in subsequent cases ^[10].

Kim Jae-hyun, a professor of pediatrics at Seoul National University Bundang Hospital, said the study is significant in that it confirmed both the pattern of occurrence by family history among Korean pediatric patients and the specific level of risk faced by siblings, and he stressed the need for early diagnosis and management based on family history ^[11].

I would fund the free half. Recording family history at the index diagnosis and teaching a household to recognise ketoacidosis costs almost nothing, and early detection can reduce the risk of acute complications such as ketoacidosis ^[13]. Serial antibody testing for 756 unaffected siblings ^[23] costs far more. At one case per 34 tested ^[14], a panel price only has to beat a thirty-fourth of the value of an avoided admission, and that value is a Korean insurance number ^[1]. Either way the disease does not change: patients need continuous insulin after diagnosis ^[12].