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However, the association between vitamin D deficiency and adverse pregnancy outcomes remains unclear and may vary across ethnic groups, in part because of genetic variation in the metabolism of vitamin D. Few studies have included Hispanic women. Therefore, we investigated this association among 237 participants in the Behaviors Affecting Baby and You Study, a randomised trial of an exercise intervention among ethnically diverse prenatal care patients in Massachusetts. Baseline serum 25-hydroxyvitamin D (25(OH)D) was measured at 15\u00b72 (<jats:sc>sd<\/jats:sc> 4\u00b77) weeks\u2019 gestation. Information on adverse pregnancy outcomes was abstracted from medical records. Mean 25(OH)D was 30\u00b74 (<jats:sc>sd<\/jats:sc> 12\u00b70) ng\/ml; 53\u00b72 % of participants had insufficient (&lt;30 ng\/ml) and 20\u00b77 % had deficient (&lt;20 ng\/ml) 25(OH)D levels. After adjusting for month of blood draw, gestational age at blood draw, gestational age at delivery, age, BMI and Hispanic ethnicity, women with insufficient and deficient vitamin D had infants with birth weights 139\u00b774 (<jats:sc>se<\/jats:sc> 69\u00b716) g (<jats:italic>P<\/jats:italic>=0\u00b7045) and 175\u00b752 (<jats:sc>se<\/jats:sc> 89\u00b745) g (<jats:italic>P<\/jats:italic>=0\u00b7051) lower compared with women with sufficient vitamin D levels (\u226530 ng\/ml). Each 1 ng\/ml increase in 25(OH)D was associated with an increased risk for gestational diabetes mellitus among Hispanic women only (relative risk 1\u00b707; 95 % CI 1\u00b703, 1\u00b711) in multivariable analysis. We did not observe statistically significant associations between maternal vitamin D status and other pregnancy outcomes. Our findings provide further support for an adverse impact of vitamin D deficiency on birth weight in Hispanic women.<\/jats:p>","DOI":"10.1017\/s0007114515003980","type":"journal-article","created":{"date-parts":[[2015,10,28]],"date-time":"2015-10-28T03:38:51Z","timestamp":1446003531000},"page":"2116-2128","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":48,"title":["Early pregnancy vitamin D status and risk for adverse maternal and infant outcomes in a bi-ethnic cohort: the Behaviors Affecting Baby and You (B.A.B.Y.) 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