Maternal characteristics according to severity of obesity.

*Tests for no association were for continuous variables T-test and ANOVA (analysis of variance), for categorical variables test for trend based on Goodman and Kruskal's gamma statistics. In tests applied to the 3 obesity groups, reference women were excluded. Subjects with missing values: exercise, n = 38; gestational weight gain, n = 1781; paternal BMI, n = 1498. Missing for other variables, n<10.