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Table 1 Serum 25(OH)D levels (ng/mL) by sex, age group, and seasonality between departments

From: Variation in vitamin D status in infants and children: a two-year cross-sectional study in Shanghai, China

Variables

Pediatrics

Child Healthcare

N

Mean

Min

Max

P25

P50

P75

N

Mean

Min

Max

P25

P50

P75

All

1121

26.6

6.1

71.4

18.4

25.5

32.9

6164

32.3

4.3

94.2

25.6

31.3

38.1

Sexa

              

 Boys

663

26.5

6.1

60.2

18.5

25.5

32.8

3185

32.3

6.9

90.7

25.7

31.4

37.9

 Girls

458

26.8

6.7

71.4

18.3

25.6

33.1

2979

32.3

4.3

94.2

25.4

31.3

38.4

Age (years)b

              

 0–1

190

34.0

6.3

56.7

28.2

33.2

39.9

1460

33.2

7.0

84.0

26.9

31.9

38.8

 1–3

250

29.7

10.0

71.4

24.6

29.3

34.6

1973

30.3

4.3

83.4

24.2

29.4

34.9

 3–6

315

24.1

6.7

58.9

17.7

23.0

28.8

2336

33.3

5.3

94.2

26.3

32.6

40.0

 6–11

366

22.7

6.1

60.2

16.1

19.7

26.9

395

33.4

8.5

76.0

25.1

32.9

41.6

Seasonalityc

              

 Spring

305

24.2

6.3

55.3

16.9

23.0

30.4

1599

31.3

7.0

94.2

24.9

30.3

36.9

 Summer

403

27.5

6.1

61.0

19.8

26.0

33.7

1777

33.1

7.4

90.7

26.5

32.1

38.7

 Autumn

239

29.6

9.7

71.4

20.8

28.2

35.0

1521

33.9

4.3

89.3

27.1

32.6

40.2

 Winter

174

24.6

6.7

56.2

16.2

23.2

31.3

1267

30.5

5.2

84.0

23.5

30.0

36.4

  1. a The serum 25(OH)D levels had no significant difference by sex within the departments of Child Healthcare (p = 0.992) and Pediatrics (p = 0.957); but were significantly different between the departments (all p < 0.001);
  2. b The serum 25(OH)D levels were significantly different by age group within and between the departments (all p < 0.001);
  3. c The serum 25(OH)D levels were significantly different by seasonality within and between the departments (all p < 0.001)
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