TABLE 4.

Prevalence of maternal 25(OH)D insufficiency and sufficiency throughout pregnancy and in umbilical cord at birth, in each treatment group¹

	Baseline		28 gestational wk		36 gestational wk		Umbilical cord
	10 µg/d	20 µg/d	10 µg/d	20 µg/d	10 µg/d	20 µg/d	10 µg/d	20 µg/d
All	n 118	n 121	n 118	n 121	n 118	n 121	n 31	n 31
<50 nmol/L	41.5	48.8	21.2	14.8	12.7	9.9	77.4	54.8
≥50 nmol/L	58.5	51.2	78.8	85.2	87.3	90.1	22.6	45.2
Normal weight
<50 nmol/L	35.9	34.1	20.5	9.8	10.3	4.9	81.8	38.52
≥50 nmol/L	64.1	65.9	79.5	90.2	89.7	95.1	18.2	62.5
Overweight
<50 nmol/L	43.6	55.0	15.4	12.5	7.7	7.5	88.9	60.0
≥50 nmol/L	56.4	45.0	84.6	87.5	92.3	92.5	11.1	40.0
Obese
<50 nmol/L	45.0	57.5	27.5	22.5	20.0	17.5	63.6	75.0
≥50 nmol/L	55.0	42.5	81.5	77.5	80.0	82.5	36.4	25.0

¹Data are percentages, with differences in maternal and infant classifications of insufficiency (<50 nmol/L) and sufficiency (≥50 nmol/L) between treatment groups assessed using a chi-square test. Data at 28 and 36 gestational wk include imputed data; blood samples available for analysis at 28 gestational wk were n = 78 and n = 80, and at 36 gestational wk were n = 73 and n = 80, in the 10-µg/d and 20-µg/d treatment groups, respectively.

²Significant difference in percentage prevalence of insufficiency and sufficiency in umbilical cord blood of normal weight women, P = 0.028. P < 0.05 considered significant.