Table 1.
Characteristics of Pregnant Adolescents by ppBMI Categories.a
| Characteristics | ppBMI, kg/m2 | No. of Participantsb | |||
|---|---|---|---|---|---|
| Underweight < 18.5 | Normal Weight 18.5-24.9 | Overweight 25.0-29.9 | Obese ≥ 30.0 | ||
| Participants, n (%) | 16 (7.0) | 127 (55.2) | 46 (20.0) | 41 (17.8) | 230 |
| Age at enrollment, years | 17.0 ± 1.1 | 17.1 ± 1.0 | 17.1 ± 1.2 | 17.4 ± 1.0 | 230 |
| ppBMI, kg/m2 | 17.5 ± 0.8e | 21.9 ± 1.8f | 27.4 ± 1.4g | 34.0 ± 4.0h | 230 |
| Parity > 0, % | 12.5 | 15.0 | 13.0 | 26.8 | 230 |
| Smoking during pregnancy, % | 6.3 | 8.0 | 4.4 | 4.9 | 227 |
| Gestational age at midgestation, weeks | 26.4 ± 3.6 | 26.2 ± 3.3 | 26.9 ± 3.2 | 25.4 ± 3.5 | 144 |
| Gestational age at delivery, weeks | 38.4 ± 3.1 | 39.1 ± 2.4 | 39.9 ± 2.2 | 39.8 ± 3.2 | 227 |
| Preterm delivery, % | 18.8 | 8.9 | 4.4 | 2.4 | 227 |
| Delivery mode, % | 224 | ||||
| Vaginal delivery | 93.8 | 91.0 | 78.3 | 87.5 | |
| Daily prenatal supplement use, % | 50.0 | 39.5 | 60.9 | 45.0 | 226 |
| Dietary iron intake, mg/dc | 21.6 ± 24.0 | 17.5 ± 7.7 | 15.0 ± 6.5 | 16.6 ± 7.8 | 216 |
| Race, % | 230 | ||||
| African American | 68.7 | 70.9 | 73.9 | 65.5 | |
| Ethnicity, % | 230 | ||||
| Non-Hispanic | 81.2 | 74.8 | 78.3 | 65.8 | |
| Weight gain adequacy at midgestation, %d | 144 | ||||
| Inadequate | 30.0 | 36.6 | 14.3 | 29.2 | |
| Adequate | 30.0 | 31.7 | 17.9 | 12.5 | |
| Excessive | 40.0 | 31.7 | 67.9 | 58.3 | |
| Total gestational weight gain adequacy, %d | 224 | ||||
| Inadequate | 26.7 | 19.5 | 8.7 | 0.0 | |
| Adequate | 26.7 | 29.3 | 15.2 | 7.5 | |
| Excessive | 46.7 | 51.2 | 79.1 | 92.5 | |
| Infant weight, kg | 2.98 ± 0.79e | 3.12 ± 0.49e | 3.42 ± 0.49f | 3.40 ± 0.45f | 223 |
Abbreviations: ppBMI, prepregnancy body mass index; SD, standard deviation.
aValues are means ± SDs. Means in rows with different letters are significantly different.
bNumbers vary because of missing values for some variables.
cMean intakes from averaged 24-hour dietary recall data; up to 3 recalls per participant.
dGroup differences were significant, P < .05 (χ2 test).