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Table 5 Comparison of serum 25(OH)D levels between seasons in the same age group (ng/ml)

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

Age group Summer-Autumn Winter-Spring P value
N P2.5 P25 P50 P75 P97.5 N P2.5 P25 P50 P75 P97.5
 < 1 year 172 39.86 71.18 90.40 114.00 151.43 135 24.42 58.40 80.50 95.50 144.20 0.002
1 ~ 2 years 268 34.70 54.55 68.90 87.20 134.38 278 30.65 54.38 67.40 87.03 131.05 0.523
3 ~ 5 years 169 22.05 32.35 48.30 66.05 103.75 196 16.80 28.13 37.90 52.18 165.68 0.000
6 ~ 14 years 264 15.36 21.85 27.5 55.90 85.53 277 15.46 22.00 27.60 56.10 85.54 0.000