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Table 1 Characteristics of Chinese pregnant women in Shanghai (n = 953)

From: Vitamin D status and vitamin D deficiency risk factors among pregnancy of Shanghai in China

Variable/group

25(OH)D (ng/ml)

P value

Percentage with 25(OH)D (ng/ml)

P value

n

Mean

95%CI

n

 < 12

12–19

20–29

30–50

Total

953

16

11–21

 

953

31.8% (303)

40.7% (388)

25.1% (239)

2.4% (23)

 

Age (years)

 20–25

120

16

15–17

8.5

120

31.7% (38)

42.5% (51)

25.8% (31)

0.0% (0)

17.6

 25–30

471

16

15–16

 

471

36.5% (172)

38.4% (181)

22.5% (106)

2.5% (12)

 

 30–35

274

17

16–18

 

274

26.3% (72)

41.6% (114)

29.6% (81)

2.6% (7)

 

  ≥ 35

88

17

15–18

0.04

88

23.9% (21)

47.7% (42)

23.9% (21)

4.6% (4)

0.04

Parity

 0

671

16

15–17

2.7

671

30.7% (206)

41.3% (277)

26.1% (175)

1.9% (13)

45

 1

248

15

14–16

 

248

35.1% (87)

40.7% (101)

23.4% (58)

0.8% (2)

 

  ≥ 2

34

14

12–15

0.04

34

29.4% (10)

29.4% (10)

17.7% (6)

23.5% (80)

0.001

Pre-pregnancy BMI (kg/m2)

 Underweight

119

17

16–18

14

119

16.0% (19)

52.1% (62)

28.6% (34)

21.1% (4)

29

 Normal

623

16

15–17

 

623

32.1% (200)

38.2% (238)

27.1% (169)

2.6% (16)

 

 Overweight

162

15

14–16

 

162

40.7% (66)

40.7% (66)

17.9% (29)

0.6% (1)

 

 Obese

49

14

13–16

0.003

49

36.7% (18)

44.9% (22)

14.3% (7)

4.1% (2)

0.01

Gestational diabetes mellitus

 Yes

56

16

15–18

13

56

39.3% (22)

32.1% (18)

25.0% (14)

3.6% (2)

2.4

 No

897

15

13–16

0.02

897

31.3% (281)

41.3% (370)

25.1% (225)

2.3% (21)

0.01

Gestational Hyperlipemia

 No

931

16

15–17

0.4

931

31.9% (297)

40.7% (379)

25.1% (234)

2.3% (21)

0.6

 Yes

22

15

13–16

0.7

22

27.3% (6)

40.9% (9)

22.7% (5)

9.1% (2)

0.9