The procedures followed for this study were in accordance with the ethical standards of the Ins tit uti ona l Rev iew Boa rd of the Uni ver sit y of Nor th Carolina School of Medicine and Wake Medical Center. Birth outcome info rmatio n was obta ined from hospital delivery logs. Sub ject s were als o inter viewe d by teleph one to obta in soci odem ogra phic data, health habits and previous as well as current medical hist ory. Several questionnaires were self- ad min ist ere d at tha t tim e inc lud ing a foo d-f req uen cy que stio nna ire for die tar y int ake. Women were recruited into the study from 24 to 29 weeks of gestation. Th e st ud y re cr ui ts pred omin antly lower- to midd le-in come women from four prenatal care clinics in two settings: the University of North Carolina Resident and Private Physician Obstetrics Cl in ic an d th e W ak e Co un ty De pa rt me nt of Hu ma n Services and Wake Area Health Education Center Prenatal Care Clinics. This study used data from the Pregnancy, Infection, and Nutrition (PIN) Study, a prospective cohort study of the de ter mi na nt s of pr e-t erm bi rth.
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