Table 1.
Maternal characteristics by BMI group.
| Overall, N = 575 | Preconception BMI <25 kg/m2, N = 335 | Preconception BMI ≥25 kg/m2, N = 240 | P value | |
|---|---|---|---|---|
| Maternal age, mean (SD) | 28.5 (4.5) | 28.6 (4.5) | 28.5 (4.6) | 0.877 |
| Preconception BMI, mean (SD) | 25.4 (5.9) | 21.6 (2.0) | 30.6 (5.5) | <0.0001 |
| Preconception HbA1c, mean (SD) | 5.0 (0.3) | 5.0 (0.3) | 5.1 (0.3) | 0.003 |
| Gestational weight gain mean (SD) | 12.7 (5.5) | 13.4 (4.7) | 11.7 (6.4) | 0.001 |
| Race | 0.652 | |||
| White | 558 (97.0%) | 326 (97.3%) | 232 (96.7%) | |
| Non-white | 17 (3.0%) | 9 (2.7%) | 8 (3.3%) | |
| Education | 0.006 | |||
| Beyond high school | 515 (89.6%) | 310 (92.5%) | 205 (85.4%) | |
| Up to high school | 60 (10.4%) | 25 (7.5%) | 35 (14.6%) | |
| Alcohol use in the past year | 0.577 | |||
| Never | 386 (67.1%) | 228 (68.1%) | 158 (65.8%) | |
| Sometimes | 182 (31.7%) | 103 (30.7%) | 79 (32.9%) | |
| Missing | 7 (1.2%) | 4 (1.2%) | 3 (1.3%) | |
| Cigarette use in the past year | 0.398 | |||
| Never | 520 (90.4%) | 306 (91.3%) | 214 (89.2%) | |
| Sometimes | 53 (9.2%) | 28 (8.4%) | 25 (10.4%) | |
| Missing | 2 (0.4%) | 0 (0%) | 0 (0%) | |
| Fasting status at preconception | 0.027 | |||
| Fasting | 70 (12.2%) | 32 (9.6%) | 38 (15.8%) | |
| Non-fasting | 498 (86.6%) | 297 (88.7%) | 201 (83.8%) | |
| Missing | 7 (1.2%) | 6 (1.8%) | 1 (0.4%) | |
| Parity | ||||
| Nulliparous | 235 (40.9%) | 140 (41.8%) | 95 (39.6%) | 0.595 |
| Parous | 340 (59.1%) | 195 (58.2%) | 145 (60.4%) | |
Maternal characteristics for the overall cohort and by BMI group (<25 v. ≥25 kg/m2), limited to n = 575 women with singleton birth between 22–43 weeks and birthweight and maternal preconception BMI available. Values are n (%) unless otherwise specified. P value for difference in characteristic by BMI group (one-way ANOVA or Chi-square) is presented.
BMI, body mass index; HbA1c, hemoglobin A1C.