Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Prevalence of vitamin D deficiency (
; 25-hydroxyvitamin D (25(OH)D) ≤25 nmol/l), insufficiency (
; 25(OH)D=25–50 nmol/l) and sufficiency (
; 25(OH)D >50 nmol/l) in 530 apparently healthy children aged 5–18 years from six Iranian provinces with a latitudinal gradient from 29°N to 37·5°N: (a) summer (August–September) and (b) winter (February–March)
