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Table 3 Paired comparison of serum 25(OH)D by season

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

Season-Season

Test statistics

Standard error

Standard test statistics

P value

Adjusted P value

Winter-Spring

33.510

36.431

0.920

0.358

1.000

Winter-Summer

149.602

37.232

4.018

0.000

0.000

Winter-Autumn

211.384

40.488

5.221

0.000

0.000

Spring–Summer

-116.092

30.362

-3.824

0.000

0.001

Spring–Autumn

-177.875

34.277

-5.189

0.000

0.000

Summer-Autumn

-61.782

35.127

-1.759

0.079

0.472