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Table 3 Adjusted relative risks (aRR) of pregnancy complications from any complication, preeclampsia (PE), gestational hypertension (GH), gestational diabetes mellitus (GDM), spontaeous preterm birth (sPTB) and small-for-gestational age (SGA) according to vitamin D status and stratified by fetal sex

From: Vitamin D levels in an Australian and New Zealand cohort and the association with pregnancy outcome

  

Pregnancy Complications

All women

Any Complication

PE

 

GH

 

GDM

 

sPTB

 

SGA

n (%)

n (%)

aRR* (95% CI)

n (%)

aRR* (95% CI)

n (%)

aRR* (95% CI)

n (%)

aRR* (95% CI)

n (%)

aRR* (95% CI)

n (%)

aRR* (95% CI)

Standardised Quartiles**

Males

 Low

367 (26)

173 (47)

1.00 (0.85, 1.18)

24 (7)

1.24 (0.65, 2.34)

31 (8)

1.11 (0.64, 1.94)

18 (5)

1.25 (0.58, 2.68)

22 (6)

1.09 (0.60, 1.98)

43 (12)

1.14 (0.73, 1.79)

 Low-Moderate

364 (26)

163 (45)

1.01 (0.86, 1.19))

20 (5)

1.11 (0.58, 2.12)

32 (9)

1.25 (0.73, 2.13)

13 (4)

1.06 (0.48, 2.38)

18 (5)

0.93 (0.49, 1.76)

45 (12)

1.23 (0.80, 1.88)

 Moderate-High

359 (25)

152 (42)

1.0†

16 (4)

1.0†

23 (6)

1.0†

11 (3)

1.0†

18 (5)

1.0†

35 (10)

1.0†

 High

325 (23)

111 (34)

0.86 (0.71, 1.04)

15 (5)

1.18 (0.59, 2.36)

17 (5)

0.90 (0.50, 1.62)

4 (1)

0.45 (0.15, 1.38)

15 (5)

0.97 (0.50, 1.88)

26 (8)

0.77 (0.47, 1.26)

Females

 Low

380 (28)

169 (44)

0.91 (0.77, 1.06)

23 (6)

0.85 (0.47, 1.55)

30 (8)

0.87 (0.52, 1.45)

13 (3)

0.51 (0.25, 1.04)

14 (4)

0.61 (0.31, 1.18)

45 (12)

0.88 (0.58, 1.35)

 Low-Moderate

353 (26)

168 (48)

0.99 (0.85, 1.15)

24 (7)

1.03 (0.57, 1.85)

31 (9)

0.92 (0.57, 1.50)

9 (3)

0.44 (0.20, 0.97)

18 (5)

0.79 (0.43, 1.45)

33 (9)

0.74 (0.48, 1.13)

 Moderate-High

334 (24)

149 (45)

1.0†

19 (6)

1.0†

28 (8)

1.0†

17 (5)

1.0†

21 (6)

1.0†

31 (9)

1.0†

 High

314 (23)

128 (41)

1.00 (0.84, 1.19)

19 (6)

1.29 (0.70, 2.35)

20 (6)

0.85 (0.49, 1.46)

6 (2)

0.48 (0.19, 1.23)

12 (4)

0.60 (0.30, 1.21)

29 (9)

0.82 (0.53, 1.28)

  1. *Relative risks compared to all women were adjusted for age, maternal body mass index, ethnicity (non Caucasian vs. Caucasian), smoking status at 15 ± 1 weeks’ gestation (no vs. yes), alcohol consumption at 15 ± 1 weeks’ (no vs yes), recreational walking (1-3×/week and ≥ 4×/week vs. never) and recruitment site (Auckland vs. Adelaide)
  2. **Serum 25(OH)D was standardised for month that serum was sampled based as previously described [34]
  3. †Reference category