Journal
PEDIATRIC RESEARCH
Volume 82, Issue 3, Pages 444-451Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/pr.2017.114
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Funding
- National Institutes of Health [K23HD052550, K24DK062895, P30 AG024827, R01HL112985, UL1 RR024153]
- Children's Hospital of Pittsburgh Research Advisory Committee
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BACKGROUND: Skin color, a vitamin D status determinant, can be assessed subjectively by Fitzpatrick sun-reactive skin typing (FST) and objectively by melanin index (MD. FST was validated against MI for discerning vitamin D deficiency (serum 25-hydroxyvitamin D (25(OH)D) <20 ng/ml) in children. METHODS: We measured FST, MI, and serum 25(OH)D in healthy, 8- to 18-year-old children from one of two vitamin D trials. MI from forehead, hand, and upper arm split at the median of the more racially balanced study cohort and FST (1 III vs. IV-V) were used for discriminating vitamin D deficiency. RESULTS: A total of 296 participants (mean age, 12.3 +/- 2.3 years; black, 208; FST IV-V, 209; 25(OH)D <20 ng/ml, 159) were studied. MI and FST had a strong positive association. Serum 25(OH)D was negatively associated with MI and FST. Sensitivity, specificity, and predictive values were similar for discriminating vitamin D deficiency between higher vs. lower MI and between FST I-III vs. IV-V. ROC area under the curves for FST (0.59) and MI (forehead (0.63); hand (0.62); and arm (0.64)) were similar. CONCLUSIONS: FST is comparable to MI for discerning vitamin D deficiency and can be deemed as an inexpensive, useful surrogate measure of skin color in the context of vitamin D research.
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