Neonatal vitamin D levels and autoimmune disorders: a Danish population-based cohort study.

We measured 25(OH)D and DBP concentrations in neonatal dried blood spots.

Cox regression was employed to estimate hazard ratios (HRs) for any autoimmune disorder and for nine specific diagnoses, in relation to 25(OH)D, DBP, and their polygenic scores (polygenic scores).

Among 20,404 eligible individuals, 757 (3.7%) developed an autoimmune disorder.

Similarly, polygenic scores for 25(OH)D and DBP did not show an association with any autoimmune disorder, with HRs of 1.04 (95% CI, 0.97-1.12) and 0.98 (95% CI, 0.91-1.05) per SD increase, respectively.