Table 1.
Maternal characteristics according to prepregnancy waist circumference and BMI among women who had term birthsa
| Prepregnancy waist circumference (quintiles, inches) (N= 5,554)b |
Prepregnancy BMI (kg/m2) (N=6,687) |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Characteristics | <27.0 (n=1,205) |
27.0–28.9 (n=1,127) |
29.0–30.9 (n=1,049) |
31.0–34.9 (n=1,212) |
≥35.0 (n=961) |
Ptrendd | <18.5 (n=104) |
18.5–24.9 (n=3,078) |
25.0–29.9 (n=1,974) |
30.0–34.9 (n=883) |
≥35.0 (n=648) |
Ptrendd |
| Age at delivery, year (mean) | 31.0 | 31.1 | 31.3 | 31.1 | 31.1 | 0.68 | 29.3 | 30.8 | 31.3 | 31.2 | 30.9 | 0.01 |
| Prepregnancy waist circumference, inches (mean) |
25.0 | 27.6 | 29.5 | 32.5 | 38.5 | - - | 25.0 | 27.7 | 31.0 | 34.0 | 38 .1 | <0.001 |
| Prepregnancy WHR (mean) | 0.72 | 0.75 | 0.78 | 0.82 | 0.86 | <0.001 | 0.75 | 0.76 | 0.79 | 0.81 | 0.81 | <0.001 |
| Prepregnancy BMI, kg/m2 (mean) | 22.3 | 23.7 | 25.5 | 28.1 | 34.3 | <0.001 | 17.8 | 22.3 | 27.2 | 32.2 | 40.6 | - - |
| Married/living as married (%) | 40.1 | 46.7 | 47.6 | 51.1 | 50.0 | <0.001 | 37.8 | 48.0 | 48.4 | 47.5 | 42.3 | 0.22 |
| Education, year (mean) | 15.3 | 15.4 | 15.3 | 15.0 | 14.8 | <0.001 | 15.1 | 15.4 | 15.1 | 14.9 | 14.7 | <0.001 |
| Family Income ≤$25,000 (%) | 5.0 | 3.5 | 5.6 | 7.6 | 11.2 | <0.001 | 9.9 | 4.5 | 7.2 | 9.5 | 12.9 | <0.001 |
| Smoked during pregnancy (%) | 1.8 | 2.0 | 3.2 | 5.4 | 5.4 | <0.001 | 7.9 | 2.6 | 4.2 | 5.1 | 5.9 | <0.001 |
| Parous (%) | 46.4 | 48.5 | 53.4 | 58.2 | 59.1 | <0.001 | 50.6 | 50.5 | 58.1 | 60.1 | 58.7 | <0.001 |
| Gestational weight gain, lb (mean) | 31.0 | 30.5 | 29.7 | 26.5 | 23.2 | <0.001 | 31.8 | 30.8 | 27.8 | 24.1 | 20.6 | <0.001 |
| Maternal medical condition (%)c | 13.7 | 15.4 | 19.7 | 25.1 | 36.7 | <0.001 | 10.3 | 15.1 | 23.3 | 30.7 | 45.1 | <0.001 |
BMI, body mass index; WHR, waist-to-hip ratio.
a
The Black Women’ Health Study, 1995–2003. All characteristics (other than age) are adjusted for age at delivery.
b
Excludes 1,133 women with missing data on waist circumference in 1995.
c
Defined as type 2 diabetes or gestational diabetes, gestational or pre-gestational hypertension, or thyroid conditions.
d
Derived from the tests for linear trend.