Validation of an enhanced pediatric vitamin D deficiency score incorporating sun exposure timing and BMI z-score: analysis in a combined cohort of children

• Incorporating weighted factors for peak UVB sun exposure and BMI z-score signifi cantly improves the predictive performance of the pediatric EVIDENCe-Q. • The Sun + BMI-weighted model shows a significant correlation with serum 25-OH-D and enhances identification of children at risk of hypovitaminosis D (30 ng/mL).