Objective: In this study, we assessed the temporal trends and relative and attributable
perinatal risks of maternal obesity over a 20-year period. Study Design: We conducted a
retrospective cohort study between 1980 and 1999 by using a computerized perinatal
database of all women who received prenatal care and delivered their infants within a
regional health care system. The main outcome measures were as follows:(1) annual mean
body weight and the percentage of women classified as obese at the first prenatal visit …