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BACKGROUND It is uncertain how best to screen pregnant women for the presence of fetal Down's syndrome: to perform first-trimester screening, to perform second-trimester screening, or to use strategies incorporating measurements in both trimesters. METHODS Women with singleton pregnancies underwent first-trimester combined screening (measurement of nuchal(More)
OBJECTIVE To estimate the effect of maternal age on obstetric outcomes. METHODS A prospective database from a multicenter investigation of singletons, the FASTER trial, was studied. Subjects were divided into 3 age groups: 1) less than 35 years, 2) 35-39 years, and 3) 40 years and older. Multivariable logistic regression analysis was used to assess the(More)
OBJECTIVE This study was undertaken to determine whether obesity is associated with obstetric complications and cesarean delivery. METHODS A large prospective multicenter database was studied. Subjects were divided into 3 groups: body mass index (BMI) less than 30 (control), 30 to 34.9 (obese), and 35 or greater (morbidly obese). Groups were compared by(More)
OBJECTIVE The purpose of this study was to determine whether patients with first-trimester threatened abortion are at increased risk for poor pregnancy outcome. STUDY DESIGN A large prospective multicenter database was studied. Subjects were divided into three groups: (1) no bleeding, (2) light bleeding, and (3) heavy bleeding. Univariate and(More)
OBJECTIVE To determine if first trimester fetal growth is associated with birth weight, duration of pregnancy, and the risk of delivering a small for gestational age infant. DESIGN Prospective cohort study of 38 033 pregnancies between 1999 and 2003. SETTING 15 centres representing major regions of the United States. PARTICIPANTS 976 women from the(More)
BACKGROUND Low plasma folate concentrations in pregnancy are associated with preterm birth. Here we show an association between preconceptional folate supplementation and the risk of spontaneous preterm birth. METHODS AND FINDINGS In a cohort of 34,480 low-risk singleton pregnancies enrolled in a study of aneuploidy risk, preconceptional folate(More)
Recent evidence indicates that individuals with acquired immunodeficiency syndrome (AIDS) or those at high risk for AIDS have an increased occurrence of lymphoma. AIDS-related lymphomas (ARLs) often present with an advanced stage of disease and highly malignant histologic subtypes. This study reviewed the abdominal computed tomographic (CT) findings in 29(More)
OBJECTIVE Comparison of contingent, step-wise and integrated screening policies. METHODS Mid-trimester Down syndrome risks were retrospectively calculated from FaSTER trial data. For contingent screening, initial risk was calculated from ultrasound measurement of nuchal translucency (NT), maternal serum pregnancy-associated plasma protein (PAPP)-A and(More)
OBJECTIVE Second-trimester sonographic findings of fetal trisomy may include structural abnormalities or sonographic markers of fetal aneuploidy. Unlike structural anomalies, sonographic markers of fetal aneuploidy are insignificant by themselves with regard to outcome, are nonspecific--most frequently seen in normal fetuses, and are often transient. Our(More)
OBJECTIVE To determine whether first- and second-trimester Down syndrome screening markers and screen-positive rates are altered in pregnancies conceived using assisted reproductive technologies (ARTs). METHODS ART pregnancies in the multicenter FASTER trial were identified. Marker levels were evaluated for five types of ART: in vitro fertilization with(More)