Table 3 Relationship between VitD intake and obstetric outcomes among women who conceived with ART
Quintile for VitD | ||||||
|---|---|---|---|---|---|---|
Q1 (low) | Q2 | Q3 | Q4 | Q5 (high) | p-valuea | |
n = 383 | n = 530 | n = 578 | n = 587 | n = 516 | ||
VitD intake before pregnancy, μg/day, median (IQR) | 1.5 (1.0–1.9) | 3.0 (2.6–3.3) | 4.3 (4.0–4.7) | 6.0 (5.4–6.6) | 10.0 (8.5–12.1) | |
PTB at < 37 weeks | ||||||
Number, n | 30 | 35 | 29 | 40 | 50 | |
Occurrence, % | 7.8 | 6,6 | 5.0 | 6.8 | 9.7 | 0.206 |
aOR (95% CI) | 1.64 (0.96–2.78) | 1.32 (0.79–2.20) | 1 (Ref) | 1.41 (0.86–2.30) | 2.05 (1.27–3.31) | |
PTB at < 34 weeks | ||||||
Number, n | 7 | 9 | 7 | 14 | 13 | |
Occurrence, % | 1.8 | 1.7 | 1.2 | 2.4 | 2.5 | 0.251 |
aOR (95% CI) | 1.50 (0.52–4.34) | 1.37 (0.50–3.72) | 1 (Ref) | 2.03 (0.81–5.09) | 1.90 (0.74–4.87) | |
LBW < 2500 g | ||||||
Number, n | 45 | 50 | 52 | 50 | 57 | |
Occurrence, % | 11.7 | 9.4 | 9.0 | 8.5 | 11.1 | 0.727 |
aOR (95% CI) | 1.30 (0.85–2.00) | 1.04 (0.69–1.57) | 1 (Ref) | 0.97 (0.65–1.46) | 1.27 (0.85–1.89) | |
LBW < 1500 g | ||||||
Number, n | 8 | 7 | 5 | 8 | 9 | |
Occurrence, % | 2.1 | 1.3 | 0.9 | 1.4 | 1.8 | 0.850 |
aOR (95% CI) | 2.36 (0.76–7.33) | 1.45 (0.45–4.64) | 1 (Ref) | 1.63 (0.53–5.04) | 1.79 (0.58–5.54) | |
SGA | ||||||
Number, n | 26 | 28 | 32 | 32 | 20 | |
Occurrence, % | 6.8 | 5.3 | 5.5 | 5.5 | 3.9 | 0.105 |
aOR (95% CI) | 1.21 (0.70–2.09) | 0.94 (0.55–1.60) | 1 (Ref) | 1.01 (0.61–1.68) | 0.65 (0.36–1.17) | |
HDP | ||||||
Number, n | 19 | 28 | 27 | 31 | 24 | |
Occurrence, % | 5.0 | 5.3 | 4.7 | 5.3 | 4.7 | 0.841 |
aOR (95% CI) | 1.01 (0.55–1.84) | 1.00 (0.57–1.74) | 1 (Ref) | 1.16 (0.68–1.97) | 0.93 (0.53–1.65) | |