Maternal Characteristic | 25(OH)D status (nmol/L) | χ2/H P- value | |||
---|---|---|---|---|---|
 | < 50 (N = 15,696) | 50–75 (N = 6981) | > 75 (N = 717) | Total (N = 23,394) |  |
Maternal Age(years) | Â | Â | Â | Â | 59.154 <.001* |
<24b | 456(2.90) | 178(2.50) | 8(1.10) | 642(2.70) | Â |
25-29a | 6894(43.90) | 2807(40.20) | 286(39.90) | 9987(42.70) | Â |
30-34ab | 6319(40.30) | 2928(41.90) | 294(41.00) | 9541(40.80) | Â |
≥35ac | 2027(12.90) | 1068(15.30) | 129(18.00) | 3224(13.80) |  |
Pre-pregnancy BMI (kg/m2) | Â | Â | Â | Â | 141.771 <.001* |
< 18.5abc | 1932(12.30) | 1037(14.90) | 170(23.70) | 3139(13.40) |  |
18.5–23.9bc | 11,448(72.90) | 5142(73.70) | 493(68.80) | 17,083(73.00) |  |
≥24abc | 2316(14.80) | 802(11.50) | 54(7.50) | 3172(13.60) |  |
Season of blood collection | Â | Â | Â | Â | 397.256 <.001* |
Spring | 4087(26.00) | 1620(23.20) | 171(23.8) | 5878(25.10) | Â |
Summer | 3268(20.80) | 2055(29.40) | 229(31.9) | 5552(23.70) | Â |
Autumn | 3835(24.40) | 1928(27.60) | 221(29.4) | 5974(25.50) | Â |
Winter | 4506(28.70) | 1378(19.70) | 106(14.8) | 5990(25.60) | Â |
No. of previous pregnancies | Â | Â | Â | Â | 14.132 .007* |
0 | 10,251(63.50) | 4433(63.50) | 451(62.90) | 15,135(64.70) | Â |
1 | 3817(24.30) | 1732(24.80) | 173(24.10) | 5722(24.50) | Â |
2 | 1628(10.40) | 816(11.70) | 93(13.00) | 2537(10.80) | Â |
Male fetus | 8033(51.20) | 3649(52.30) | 381(53.10) | 12,306(51.60) | 3.040 .219* |
Family history of diabetes | 1314(8.40) | 579(8.30) | 56(7.80) | 1914(8.33) | .301 .860* |
Family history of thyroid disease | 3 | 7 | 0 | – | – |
Maternal Age(years) (Mean ± SD)ab | 30.30 ± 3.64 | 30.64 ± 3.70 | 30.93 ± 3.69 | 30.42 ± 3.66 | 58.510 <.001# |
Pre-pregnancy BMI (kg/m2) (Mean ± SD)abc | 21.23 ± 2.77 | 20.87 ± 2.62 | 20.15 ± 2.25 | 21.09 ± 2.72 | 58.643 <.001# |