Deliveries. Trained research nurses measured birth weight. Gestational age was calculated from the LMP date unless different by >14 d from that estimated by an ultrasound scan (9%) at
Deliveries. Trained research nurses measured birth weight. Gestationalage was calculated from the LMP date unless different by >14 d fromthat estimated by an ultrasound scan (9%) at <20 wk, when the latterwas used