Table 1.
Maternal Demographics by Prepregnancy Body Mass Index Status
| Demographic values by maternal BMI cohorts | Under Weight | Normal Weight | Over Weight | Obese | P values* |
|---|---|---|---|---|---|
| Number of mother baby pairs | 146 | 2939 | 1653 | 1456 | |
| Weight at onset of pregnancy(lb)a | 104.1±12.5 | 131.1±15.4 | 160.1±16.5 | 213.5±37.0 | < 0.01 |
| Age at onset of pregnancy(years)a | 25.6±5.8 | 28.0±5.6 | 28.2±5.6 | 28.4±5.5 | < 0.01 |
| Married | 78.7% | 84.4% | 81.6% | 80.2% | < 0.01 |
| Medicaid insurance | 8.9% | 4.6% | 4.9% | 8.8% | < 0.01 |
| Parity ≤ 1 | 94.0% | 83.3% | 77.5% | 71.8% | < 0.01 |
| C-section delivery | 18.5% | 19.4% | 25.2% | 34.3% | < 0.01 |
| Whiteb | 57.2% | 71.1% | 74.2% | 77.0% | < 0.01 |
| Asianb | 34.0% | 17.0% | 8.3% | 3.3% | |
| Blackb | 2.1% | 2.9% | 4.3% | 5.2% | |
| Hispanic ethnicityb | 6.2% | 8.1% | 12.1% | 12.8% | |
| Maternal tobaccoc | 14.6% | 10.4% | 11.7% | 15.9% | < 0.01 |
| Maternal atopy | 43.8% | 47.8% | 48.4% | 47.7% | 0.76 |
| Maternal asthma | 9.6% | 13.1% | 16.0% | 22.6% | < 0.01 |
a
Mean±SD or percentage as indicated
b
Category percentages slightly less than 100% due to small percent of “other”
c
Data on tobacco use missing for <1% of patients
*
The null hypothesis “no differences among the four BMI categories” was tested via a chi-square or Fisher’s exact procedure for the binary variables and via a Kruskal-Wallis procedure for the interval-scale variables. Here, Fisher’s procedure is not exact due to the stochastic marginal counts.