Serum 25‐Hydroxyvitamin D Levels in Finnish Children Aged 2 to 17 Years

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Abstract
Serum levels of 25‐hydroxyvitamin D (25‐OHD) in summer and winter were studied in 564 children aged 2–17 years living in the northern, central or southern parts of Finland. The mean levels of 25‐OHD were significantly lower in winter (13.3 ± 10.8 ng/ml) than in summer (27.2 ± 10.3 ng/ml) in all age groups (p < 0.001). The mean 25‐OHD levels in the northern part of the country did not differ significantly from the others. In both seasons the levels of 25‐OHD were lower in the 11–17 year age group than in younger children. In that age group 22.4 % of the children had serum levels of 25‐OHD below 5 ng/ml (the limit of risk for rickets), compared to 16.8 % of children 6–10 years old and 7.5 % of children 2–5 years old, but none of the children showed any laboratory evidence of rickets.

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