Table 3.
Multivariable linear regression model of total number of chemicals detected in wristbands worn at 12 gestational weeks.
| Beta (95% CI) | ||
|---|---|---|
| Age at enrollment (years) | −0.05 (−0.19, 0.09) | |
| BMI (kg/m2) | 0.00 (−0.08, 0.08) | |
| Educational attainment | Less than college graduate | Ref |
| College graduate | −0.27 (−1.95, 1.42) | |
| Any post-graduate | −1.40 (−3.53, 0.73) | |
| Relationship status | Married | Ref |
| Unmarried | 0.71 (−1.13, 2.56) | |
| Race and ethnicity | White non-hispanic | Ref |
| Other | −0.05 (−1.40, 1.29) | |
| Parity | 0 | Ref |
| ≥1 | −0.38 (–1.72, 0.96) | |
| Smoke exposure during pregnancy | None | Ref |
| First- or second-hand exposure | 0.71 (−1.20, 2.61) | |
| Gestational age start (weeks) | Median (IQR) | −0.02 (−0.13, 0.09) |
| Season of wear | Fall | Ref |
| Winter | −1.76 (−3.32, −0.21) | |
| Spring | −0.99 (−2.46, 0.49) | |
| Summer | −2.32 (−4.02, −0.61) |
Chemical concentrations median standardized to batch, and centered (mean = 0) and scaled (standard deviation = 1).
CI, confidence interval; IQR, interquartile range.