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European Journal of Pediatrics

, Volume 172, Issue 12, pp 1607–1617 | Cite as

Vitamin D status and predictors of hypovitaminosis D in Italian children and adolescents: a cross-sectional study

  • Francesco VierucciEmail author
  • Marta Del Pistoia
  • Margherita Fanos
  • Martina Gori
  • Giorgia Carlone
  • Paola Erba
  • Gabriele Massimetti
  • Giovanni Federico
  • Giuseppe Saggese
Original Article

Abstract

Hypovitaminosis D affects children and adolescents all around the world. Italian data on vitamin D status and risk factors for hypovitaminosis D during pediatric age are lacking. Six hundred fifty-two children and adolescents (range 2.0–21.0 years) living in the northwestern area of Tuscany were recruited at the Department of Pediatrics, University Hospital Pisa. None of them had received vitamin D supplementation in the previous 12 months. 25-hydroxyvitamin D (25-OH-D) and parathyroid hormone (PTH) levels were analyzed in all subjects. Severe vitamin D deficiency was defined as serum levels of 25-OH-D < 25.0 nmol/L (10.0 ng/mL) and vitamin D deficiency as < 50.0 nmol/L (20.0 ng/mL). Serum 25-OH-D levels of 50.0–74.9 nmol/L (20.0–29.9 ng/mL) indicated vitamin D insufficiency, whereas 25-OH-D levels ≥ 75.0 nmol/L (30.0 ng/mL) were considered sufficient. Hypovitaminosis D was defined as 25-OH-D levels < 75.0 nmol/L (30.0 ng/mL). The median serum 25-OH-D level was 51.8 nmol/L, range 6.7–174.7 (20.7 ng/mL, range 2.7–70.0), with a prevalence of vitamin D deficiency, insufficiency, and sufficiency of 45.9, 33.6, and 20.5 %, respectively. The prevalence of severe vitamin D deficiency was 9.5 %. Adolescents had lower median 25-OH-D levels (49.8 nmol/L, range 8.1–174.7; 20.0 ng/mL, range 3.2–70.0) than children (55.6 nmol/L, range 6.8–154.6; 22.3 ng/mL, range 2.7–61.9, p = 0.006). Non-white individuals (n = 37) had median serum 25-OH-D levels in the range of deficiency (28.2 nmol/L, range 8.1–86.2; 11.3 ng/mL, range 3.2–34.5), with 36/37 having hypovitaminosis D. Logistic regression showed significant increased risk of hypovitaminosis D in the following: blood samples taken in winter (odds ratio (OR) 27.20), spring (OR 26.44), and fall (OR 8.27) compared to summer; overweight (OR 5.02) and obese (OR 5.36) subjects compared to individuals with normal BMI; low sun exposure (OR 8.64) compared to good exposure, and regular use of sunscreens (OR 7.06) compared to non-regular use. Gender and place of residence were not associated with vitamin D status. The 25-OH-D levels were inversely related to the PTH levels (r = −0.395, p < 0.0001). Sixty-three out of the 652 (9.7 %) subjects showed secondary hyperparathyroidism. Conclusion Italian children and adolescents who were not receiving vitamin D supplementation had high prevalence of hypovitaminosis D. Careful identification of factors affecting vitamin D status is advisable to promptly start vitamin D supplementation in children and adolescents.

Keywords

Vitamin D deficiency Vitamin D insufficiency 25-hydroxivitamin D Parathyroid hormone Children Adolescents 

Abbreviations

25-OH-D

25-hydroxyvitamin D

BMI

body mass index

OR

odds ratio

PTH

parathyroid hormone

SPF

sun protector factor

Conversion factors (international units = conventional units)

25-hydroxyvitamin D

nmol/L = ng/mL × 2.496

Parathyroid hormone

pg/mL = ng/L

Calcium

mmol/L = mg/dL × 0.25

Phosphate

mmol/L = mg/dL × 0.323

Notes

Competing interests

The authors declare that they have no competing interests.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Francesco Vierucci
    • 1
    Email author
  • Marta Del Pistoia
    • 1
  • Margherita Fanos
    • 1
  • Martina Gori
    • 1
  • Giorgia Carlone
    • 1
  • Paola Erba
    • 2
  • Gabriele Massimetti
    • 3
  • Giovanni Federico
    • 1
  • Giuseppe Saggese
    • 1
  1. 1.Pediatric Unit, Department of PediatricsSanta Chiara University HospitalPisaItaly
  2. 2.Nuclear Medicine UnitSanta Chiara University HospitalPisaItaly
  3. 3.Section of Psychiatry, Department of Clinical and Experimental MedicineSanta Chiara University HospitalPisaItaly

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