Medical records were reviewed to obtain demographic data, delivery
information, and maternal and neonatal outcomes. Gestational weights at
⩽14 weeks, 20 weeks and 28 weeks, and the weight at the last visit prior to
delivery were collected. Rates of gestational weight gain at o20 , 20 to 28 weeks and during
the entire pregnancy were calculated by dividing the gestational weight gain during that
time period by the exact fractionated number of weeks between the
corresponding visits. The primary variable evaluated was gestational weight gain at 20 to
28 weeks. If delivery occurred at o28 weeks, the weight divided by the
gestational age at the last visit was used for rate calculations