RT Journal
A1 Gordon CM, DePeter KC, Feldman HA, Grace E, Emans S
T1 PRevalence of vitamin d deficiency among healthy adolescents
JF Archives of Pediatrics & Adolescent Medicine
JO Archives of Pediatrics & Adolescent Medicine
YR 2004
FD June 1
VO 158
IS 6
SP 531
OP 537
DO 10.1001/archpedi.158.6.531
UL http://dx.doi.org/10.1001/archpedi.158.6.531
AB Background 
    Although vitamin D deficiency has been documented as a frequent problem in studies of young adults, elderly persons, and children in other countries, there are limited data on the prevalence of this nutritional deficiency among healthy US teenagers.Objective 
    To determine the prevalence of vitamin D deficiency in healthy adolescents presenting for primary care.Design 
    A cross-sectional clinic-based sample.Setting 
    An urban hospital in Boston.Participants 
    Three hundred seven adolescents recruited at an annual physical examination to undergo a blood test and nutritional and activity assessments.Main Outcome Measures 
    Serum levels of 25-hydroxyvitamin D (25OHD) and parathyroid hormone, anthropometric data, nutritional intake, and weekly physical activity and lifestyle variables that were potential risk factors for hypovitaminosis D.Results 
    Seventy-four patients (24.1%) were vitamin D deficient (serum 25OHD level, ≤15 ng/mL [≤37.5 nmol/L]), of whom 14 (4.6%) were severely vitamin D deficient (25OHD level, ≤8 ng/mL [≤20 nmol/L]). By using a broader definition (25OHD level, ≤20 ng/mL [≤50 nmol/L]), 129 patients (42.0%) were vitamin D insufficient. Serum 25OHD levels were inversely correlated with parathyroid hormone levels (r = −0.29), and were 24% lower during winter compared with summer. In a final multivariate model, season, ethnicity, milk and juice consumption, body mass index, and physical activity were significant independent predictors of hypovitaminosis D.Conclusions 
    Vitamin D deficiency was present in many US adolescents in this urban clinic-based sample. The prevalence was highest in African American teenagers and during winter, although the problem seems to be common across sex, season, and ethnicity.