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Median values (interquartile range) of the maternal characteristics of the sample
| Caucasian (n = 206) | African American (n = 71) | P for difference | |
|---|---|---|---|
| Maternal age (years) | 30 (27–34) | 25 (21–31) | 0.001 |
| Prepregnancy weight (kg) | 63.3 (56.7–73.9) | 68.2 (57.6–88.0) | 0.02 |
| Pregnancy weight gain (kg) | 14.0 (10.3–18.2) | 11.3 (5.4–15.9) | 0.003 |
| Maternal weight after delivery (kg) | 79.7 (70.3–88.5) | 81.6 (66.8–97.1) | 0.79 |
| Maternal smoking | n = 14 | n = 1 | 0.08 |
