title: [VITAMIN D DEFICIENCY AMONG CHILDREN AND ADOLESCENTS WITH NORMAL NUTRITIONAL STATUS].
abstract: OBJECTIVE
  to analyze the prevalence of vitamin D deficiency throughout a natural year in a pediatric population with normal nutrition status.
  
  
  METHODS
  cross sectional clinical and analytical study (calcium, phosphorus, alkaline phosphatase, calcidiol and parathyroid hormone) in 413 caucasian individuals (aged 3.1 to 15.4 years): 227 school children (96 males and 131 females) and 186 adolescents (94 males and 92 females), all of them in a normal nutrition status, during the year 2014. Vitamin D deficiency was defined according to the United States Endocrine Society guidelines.
  
  
  RESULTS
  calcidiol levels were lower during spring (25.96 ± 6.64 ng/ml) and reached its maximum level in summer (35.33 ± 7.51 ng/ml); PTH levels were lower in summer (27.13 ± 7.89 pg/ml) and reached maximum level in autumn (34.73 ± 15.38 pg/ml). Vitamin D deficiency prevalence was 14.3% in summer and 75.3% in spring. PTH levels were compatible with secondary hyperparathyroidism in 8 individuals (1.9%). There was a negative correlation between calcidol and PTH levels (p < 0.01). There was not a correlation between body mass index (BMI) and calcidiol.
  
  
  CONCLUSIONS
  the pediatric population in normal nutrition status shows a high prevalence of vitamin D deficiency during the months of autumn and winter and, especially, in spring; the addition of vitamin supplements and/ or an increase in the ingestion of their natural dietary sources should be considered.
authors: Departamento de Pediatría, Facultad de Medicina. Universidad de Navarra. Unidad de Endocrinología Pediátrica. Complejo Hospitalario de Navarra. Instituto de Investigación Sanitaria de Navarra (IdisNA), España.. tduratra@cfnavarra.es.
authors: Teodoro
authors: T
authors: Durá-Travé
authors: Unidad de Endocrinología Pediátrica. Complejo Hospitalario de Navarra.. tduratra@cfnavarra.es.
authors: Fidel
authors: F
authors: Gallinas-Victoriano
authors: Unidad de Endocrinología Pediátrica. Complejo Hospitalario de Navarra. Instituto de Investigación Sanitaria de Navarra (IdisNA), España.. tduratra@cfnavarra.es.
authors: María Jesús
authors: MJ
authors: Chueca Guindulain
authors: Unidad de Endocrinología Pediátrica. Complejo Hospitalario de Navarra. Instituto de Investigación Sanitaria de Navarra (IdisNA), España.. tduratra@cfnavarra.es.
authors: Sara
authors: S
authors: Berrade-Zubiri
mesh_terms: D000293:Adolescent; D015992:Body Mass Index; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D019587:Dietary Supplements; D005260:Female; D006801:Humans; D008297:Male; D015596:Nutrition Assessment; D009752:Nutritional Status; D010281:Parathyroid Hormone / Q000097:blood; D015995:Prevalence; D012621:Seasons; D014807:Vitamin D / Q000097:blood; D014808:Vitamin D Deficiency / Q000097:blood / Q000453:epidemiology*
chemical_list: D010281:Parathyroid Hormone; D014807:Vitamin D