Table 1.
Characteristics of participants in the BPA reliability subset, those with a complete set of pregnancy urine specimens, and the overall Generation R cohort.
| Characteristic | BPA subset (n=80) |
Three urine specimens and complete data (n=1 024) |
Three urine specimens (n=2 083) |
Generation R Cohort (n=9 778) |
P value1 |
|---|---|---|---|---|---|
| Number of pregnancies in study (%)2 | <0.0001 | ||||
| 1 | 82.5 | 85.4 | 86.4 | 83.8 | |
| 2 | 17.5 | 14.5 | 13.4 | 5.1 | |
| 3 | 0 | 0.2 | 0.1 | 0.1 | |
| Missing | 0 | 0 | 0.2 | 11.1 | |
| Age at enrollment (years)3 | 31.9±4.4 | 31.1±4.3 | 29.30±5.0 | 29.9±5.4 | <0.0001 |
| Parity (%) | 0.17 | ||||
| 0 | 52.5 | 62.5 | 57.5 | 53.0 | |
| 1 | 36.3 | 27.7 | 29.3 | 29.0 | |
| ≥2 | 11.2 | 9.8 | 12.3 | 14.2 | |
| Missing | 0 | 0 | 0.9 | 3.8 | |
| Ethnicity (%) | <0.0001 | ||||
| Dutch, other European | 73.8 | 70.2 | 48.4 | 45.4 | |
| Surinamese | 7.5 | 5.9 | 8.2 | 7.8 | |
| Moroccan | 2.5 | 3.2 | 6.6 | 5.7 | |
| Turkish | 7.5 | 7.7 | 9.0 | 7.8 | |
| Dutch Antilles | 1.3 | 2.1 | 2.5 | 3.0 | |
| Cape Verdian | 1.3 | 1.7 | 3.4 | 3.6 | |
| Others | 6.3 | 9.3 | 17.9 | 16.2 | |
| Missing | 0 | 0 | 4.0 | 10.5 | |
| Highest completed education (%) | <0.0001 | ||||
| Primary school | 7.5 | 6.3 | 9.4 | 9.8 | |
| Intermediate | 25.0 | 35.0 | 41.0 | 40.3 | |
| Higher | 67.5 | 58.7 | 43.9 | 37.4 | |
| Missing | 0 | 0 | 5.7 | 12.5 |
1
P values compare the BPA subset (n=80) to the Generation R Cohort (n=9778). P values are calculated by Fisher’s exact test for number of pregnancies in the study, by chi-square for parity, ethnicity, and education, and by t-test for age.
2
Percents may not sum to 100 because of rounding.
3
Mean ± standard deviation