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Table 4 Comparison of serum 25(OH)D levels between different age groups, M (P25 ~ P75)

From: The establishment of serum 25-hydroxyvitamin D reference intervals in children aged 0–14 years in Zigong area, China

Age group Number of cases 25(OH)D (ng/ml)
 < 6 months 74 81.60 (63.88 ~ 101.50)a
6 ~ 11 months 233 85.40 (66.10 ~ 109.00)a
1 ~ 2 years 546 68.20 (54.50 ~ 87.13)
3 ~ 5 years 365 40.70 (30.50 ~ 59.35)
6 ~ 9 years 315 26.70 (22.30 ~ 41.50)b
10 ~ 14 years 226 23.10 (18.70 ~ 32.63)b
Z value   828.836
P value   0.000*
  1. aNo statistical difference between groups aged < 6 months and 6 ~ 11 months.
  2. bNo statistical difference between groups aged 6 ~ 9 years and 10 ~ 14 years.
  3. *Statistical difference between age groups overall.