Table 3.
Multiple logistic regression for enrolling to the study.
| Variables | Regression coefficient | Standard error | P value | Odds ratio | 95% Confidence interval |
|---|---|---|---|---|---|
| Intercept | −3.17 | 0.64 | <0.01 | 0.04 | 0.01–0.15 |
| BMI (kg/m2) | 0.06 | 0.02 | <0.01 | 1.06 | 1.02–1.10 |
| Postpartum (years) | 0.22 | 0.06 | <0.01 | 1.24 | 1.10–1.40 |
| Breastfeeding | 1.61 | 0.39 | <0.01 | 5.0 | 2.34–10.65 |
| Postpartum status*breastfeeding | −0.86 | 0.33 | <0.01 | 0.42 | 0.22–0.81 |
| Race | 0.57 | 0.16 | <0.01 | 1.77 | 1.29–2.42 |
| Smoking status | −0.62 | 0.15 | <0.01 | 0.54 | 0.40–0.73 |
| Education | 0.19 | 0.08 | 0.02 | 1.21 | 1.04–1.42 |
*Interaction. Breastfeeding: 0 = No, 1 = Yes. Race: 1 = African American, 2 = White. Smoking: 0 = No, 1 = Yes. Education: 1 = 8th. grade or less, 2 = some high school, 3 = high school graduate, 4 = some college or technical school, and 5 = college graduate or higher.