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Table 2 Distribution of maternal demographic characteristics (N = 23,394)

From: Relationship between maternal vitamin D status in the first trimester of pregnancy and maternal and neonatal outcomes: a retrospective single center study

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)      59.154
<.001*
<24b 456(2.90) 178(2.50) 8(1.10) 642(2.70)  
25-29a 6894(43.90) 2807(40.20) 286(39.90) 9987(42.70)  
30-34ab 6319(40.30) 2928(41.90) 294(41.00) 9541(40.80)  
≥35ac 2027(12.90) 1068(15.30) 129(18.00) 3224(13.80)  
Pre-pregnancy BMI (kg/m2)      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      397.256
<.001*
Spring 4087(26.00) 1620(23.20) 171(23.8) 5878(25.10)  
Summer 3268(20.80) 2055(29.40) 229(31.9) 5552(23.70)  
Autumn 3835(24.40) 1928(27.60) 221(29.4) 5974(25.50)  
Winter 4506(28.70) 1378(19.70) 106(14.8) 5990(25.60)  
No. of previous pregnancies      14.132
.007*
0 10,251(63.50) 4433(63.50) 451(62.90) 15,135(64.70)  
1 3817(24.30) 1732(24.80) 173(24.10) 5722(24.50)  
2 1628(10.40) 816(11.70) 93(13.00) 2537(10.80)  
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#
  1. * chi-square test; # Kruskal—Wallis H-test; Multiple comparison were adjusted with Bonferroni calculation
  2. a. Indicates significant differences between deficient group (< 50 nmol/L) and insufficient group(50 – 75 nmol/L);
  3. b. Indicates significant differences between deficient group and sufficient group(> 75 nmol/L);
  4. c. Indicates significant differences between insufficient group and sufficient group;