title: Association of modifiable and nonmodifiable factors with vitamin D status in pregnant women and neonates in Oakland, CA.
abstract: There is little information on the contribution of modifiable vs nonmodifiable factors to maternal and neonatal vitamin D status in temperate regions of the United States. The purpose of this cross-sectional observation study conducted between December 2006 and February 2008 was to identify associations between observed and measured maternal characteristics and vitamin D status at term in pregnant women and their infants in a multiethnic community in Oakland, CA. Two hundred seventy-five pregnant women aged 18 to 45 years and carrying a singleton fetus were recruited and data from 210 mother-infant pairs were included in analyses. Analysis of covariance identified predictors of maternal and cord serum 25-hydroxyvitamin D [25(OH)D] in a multivariate model considering vitamin D intake, lifestyle factors, and skin pigmentation. Maternal serum 25(OH)D was significantly associated with season of delivery (P=0.0002), average daily D intake (P=0.0008), right upper inner arm pigmentation (P=0.0035), and maternal pre- or early-pregnancy body mass index (calculated as kg/m²) (P=0.0207). The same factors were significant for cord serum 25(OH)D, which was highly correlated with maternal serum 25(OH)D (r=0.79; P<0.0001). During the year, 54% of mothers and 90% of neonates had 25(OH)D <30 ng/mL (<75 nmol/L). Of women taking daily prenatal vitamin/mineral supplements (400 IU vitamin D), 50.7% had serum 25(OH)D <30 ng/mL (<75 nmol/L). In conclusion, 25(OH)D <30 ng/mL (<75 nmol/L) was prevalent in mothers and neonates across racial groups and seasons, and vitamin D status was associated with both modifiable and nonmodifiable risk factors.
authors.affiliation: US Department of Agriculture, Agricultural Research Services, Western Human Nutrition Research Center, Davis, CA, USA. daphnadror@gmail.com
authors.forename: Daphna K
authors.initials: DK
authors.lastname: Dror
authors.forename: Janet C
authors.initials: JC
authors.lastname: King
authors.forename: David J
authors.initials: DJ
authors.lastname: Durand
authors.forename: Lindsay H
authors.initials: LH
authors.lastname: Allen
mesh_terms: D000293:Adolescent; D000328:Adult; D002140:California / Q000453:epidemiology; D003430:Cross-Sectional Studies; D019587:Dietary Supplements; D005260:Female; D005312:Fetal Blood / Q000737:chemistry; D006801:Humans; D007231:Infant, Newborn / Q000097:blood*; D008019:Life Style; D008297:Male; D008875:Middle Aged; D009752:Nutritional Status; D011247:Pregnancy / Q000097:blood*; D011248:Pregnancy Complications / Q000097:blood / Q000453:epidemiology / Q000209:etiology; D039401:Prenatal Nutritional Physiological Phenomena / Q000502:physiology; D012307:Risk Factors; D012621:Seasons; D012880:Skin Pigmentation / Q000502:physiology; D014807:Vitamin D / Q000008:administration & dosage* / Q000097:blood*; D014808:Vitamin D Deficiency / Q000097:blood* / Q000453:epidemiology / Q000209:etiology; D055815:Young Adult
chemical_list: D014807:Vitamin D