Table 1:
Maternal and child characteristics and specific gravity-corrected urinary OPE metabolite concentrations (n = 219), the HOME Study (2003–2006).
| Maternal Characteristic | N | % |
|
| ||
| Race | ||
| Non-Hispanic White | 134 | 61.2 |
| Other race | 85 | 38.8 |
| Education | ||
| High school or less | 55 | 25.1 |
| Any college or trade school | 125 | 57.1 |
| Graduate school | 39 | 17.8 |
| Age at delivery [median, IQR] | 29.3 | 24.9, 33.2 |
|
| ||
| Child Characteristic | N | % |
|
| ||
| Sex | ||
| Male | 96 | 43.8 |
| Female | 123 | 56.2 |
| Ever breastfed | ||
| Yes | 177 | 80.8 |
| No | 42 | 19.2 |
|
| ||
| OPE Metabolite Concentrations (pg/L)* | Median | IQR |
|
| ||
| BCEP | ||
| 16 weeks | 0.60 | 0.34, 1.07 |
| 26 weeks | 0.50 | 0.23, 1.09 |
| Delivery | 0.53 | 0.28, 1.10 |
| 1 year | 1.13 | 0.47, 2.73 |
| 2 years | 0.95 | 0.49, 2.54 |
| 3 years | 1.21 | 0.50, 3.04 |
| 5 years | 0.80 | 0.39, 1.87 |
| BDCIPP | ||
| 16 weeks | 0.81 | 0.49, 1.49 |
| 26 weeks | 0.61 | 0.29, 1.13 |
| Delivery | 0.64 | 0.62, 1.32 |
| 1 year | 1.60 | 0.79, 3.40 |
| 2 years | 2.04 | 1.03, 4.30 |
| 3 years | 3.65 | 1.50, 7.12 |
| 5 years | 3.36 | 1.59, 8.15 |
| DPHP | ||
| 16 weeks | 1.63 | 0.94, 3.13 |
| 26 weeks | 1.32 | 0.79, 2.33 |
| Delivery | 1.68 | 0.93, 3.35 |
| 1 year | 2.28 | 1.59, 4.00 |
| 2 years | 2.70 | 1.65, 4.57 |
| 3 years | 2.68 | 1.70, 4.81 |
| 5 years | 2.69 | 1.60, 6.42 |
Abbreviations: HOME Study, Health Outcomes and Measures of the Environment Study; IQR, interquartile range; OPE, organophosphate ester; BCEP, bis-2-chloroethyl phosphate; BDCIPP, bis(1,3-dichloro-2-propyl) phosphate; DPHP, diphenyl phosphate.
*
The limit of detection for all OPE metabolites was 0.1 μg/L.