Abstract:weeks gestation provided a blood sample and completed a food frequency and sociodemographic/health behavior questionnaire. Both serum (n = 1825) and red blood cell (n = 887) folate were analyzed using immunoassay techniques. Dietary folate was poorly correlated with serum (r = -0.08) and red blood cell (-0.05) folate, even after accounting for supplement use. Serum folate was moderately associated with red blood cell folate r = 0.43. The lowest tertile of serum folate was consistently associated with preterm b… Show more
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