Table 3.
Mean Covariate-Adjusted Weight Change (kg) from Baseline (6 Weeks) to 12, 18, and 24 Months Postpartum due to Unit Change in Predictor
| Predictors | Weight change at 12 months β coefficient (SE) | Weight change at 18 months β coefficient (SE) | Weight change at 24 months β coefficient (SE) |
|---|---|---|---|
| Reference groupa | 6.08 (1.6) | 6.43 (1.3) | 5.95 (1.3) |
| Age (per year) | −0.04 (0.1) | 0.01 (0.1) | 0.06 (0.1) |
| African American | 0.25 (0.8) | 0.05 (0.8) | 0.57 (0.8) |
| Some college | −0.84 (1.1) | −0.25 (1.1) | −0.04 (1.0) |
| College degree | −2.48* (1.1) | −2.36* (1.1) | −2.17* (1.0) |
| Married/cohabiting | −1.79 (1.0) | −2.56** (0.9) | −2.01* (0.9) |
| Two children | −0.12 (0.7) | 0.08 (0.7) | −0.76 (0.7) |
| Three or more children | −1.97* (0.9) | −2.11* (0.9) | −2.20* (0.9) |
| Baseline weight (per 10 kg) | 0.82*** (0.0) | 0.74** (0.0) | 0.64** (0.0) |
| Height (per 10 cm) | −0.55 (0.1) | −1.08* (0.1) | −1.11* (0.1) |
| Pregnancy weight gain (per kg) | −0.19*** (0.0) | −0.21*** (0.0) | −0.19*** (0.0) |
| Pregnancy since baseline | 0.34 (1.5) | −0.33 (1.0) | 1.51* (0.7) |
| Study intervention arm | −0.04 (0.6) | 0.51 (0.6) | 0.79 (0.6) |
| Junk food scoreb | 0.90* (0.4) | 1.20** (0.4) | 1.34** (0.4) |
| Healthy food scoreb | 0.02 (0.4) | −0.35 (0.4) | −0.36 (0.3) |
| Physical activityc | −0.91*** (0.2) | −0.84** (0.2) | −1.09*** (0.2) |
| Lactation score (per unit) | −0.03 (0.0) | 0.00 (0.0) | 0.02 (0.0) |
| Hormonal contraception (at 12 months) | −1.17 (0.7) | −1.32 (0.7) | −1.45 (0.7) |
Significant effects in bold: *p<0.05; **p<0.01; ***p<0.0001.
a
Mean age (30.9 years); not African American; high school education or less; single; one child; mean weight (88.8 kg); mean height (163.8 cm); mean pregnancy weight gain (14.9 kg); mean junk food or healthy food score (zero); zero days per week of physical activity; lactation score of zero (never breastfed); not using hormonal contraception; in study control arm.
b
Per junk food or healthy food score unit (1 SD); mean of current and prior scores.
c
Per days per week of physical activity; mean of measures reported at current and prior time points.