A total of 17,077 records were available after limiting the
dataset to the last singleton birth per mother. Following exclusion
of 280 women with abnormal weight and height, 191
with missing data for race, 15 for missing parity and age, and
9 with a gestational age <20 weeks, 16,582 (97%) women were
included in the analysis. Table 1 shows the characteristics of
the cohort, which included 61.9% white, 22.2% black, 10.4%
Hispanic, and 4.9% Asian women; 35.8% were nulliparous.
The average age of the women in the cohort was 28.96.2
years, and the average BMI was 26.06.0 kg=m2. There was
no significant difference in mean age for women with and
without PIH ( p¼0.39); however, the mean BMI of women
with PIH was 28.96.9 compared with 25.75.9 for women
without PIH ( p<0.0001).
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