Table 1.
Baseline demographics (imputed to n=1614)1
| Characteristic | Study population n(%) |
|---|---|
| Age at enrollment | |
| Mean (SD) age (years) | 31.8 (5.2) |
| <25 years | 153 (9.5) |
| 25 - <30 years | 348 (21.6) |
| 30 - <35 years | 665 (41.2) |
| ≥ 35 years | 448 (27.8) |
| Year of enrollment | |
| 1999 | 405 (25.1) |
| 2000 | 597 (37.0) |
| 2001 | 559 (34.6) |
| 2002 | 53 (3.3) |
| Pre-pregnancy body mass index | |
| Median (IQR) BMI (kg/m2) | 23.6(21.2 - 27.5) |
| <25.0 kg/m2 | 993 (61.5) |
| 25.0 - <30.0 kg/m2 | 359 (22.3) |
| ≥ 30.0 kg/m2 | 262 (16.2) |
| Race/ethnicity | |
| White | 1104 (68.4) |
| Black | 254 (15.7) |
| Other | 256 (15.8) |
| Parity | |
| 0 | 794 (49.2) |
| 1 | 559 (34.6) |
| >1 | 261 (16.2) |
| Education | |
| < College graduate | 574 (35.6) |
| College graduate or more | 1040 (64.4) |
| Married or cohabitating | |
| No | 143 (8.9) |
| Yes | 1471 (91.1) |
| Smoking status | |
| Smoked during pregnancy | 212 (13.2) |
| Former | 300 (18.6) |
| Never | 1101 (68.2) |
| Annual household income | |
| ≤ $70,000/year | 687 (42.5) |
| >$70,000/year | 927 (57.5) |
1
Calculated from all imputations and Ns are rounded to the nearest integer; values may not sum to 1614.