Table 3.
Mean maternal urinary BPA concentrations as a function of maternal characteristics.
| BPA µg/L (n=80) |
BPA µg/g creatinine (n=65) |
|||
|---|---|---|---|---|
| Maternal characteristic | N1 (obs) | GM (95% CI)2 | N (obs) | GM (95% CI)2 |
| Age at enrollment | ||||
| 20–29 | 21 (63) | 1.2 (0.8, 1.8) | 18 (54) | 2.5 (1.9, 3.3) |
| 30–34 | 44 (132) | 1.3 (1.0, 1.8) | 34 (102) | 3.1 (2.6, 3.8) |
| ≥35 | 15 (45) | 2.1 (1.3, 3.4) | 13 (39) | 3.9 (2.8, 5.5) |
| p-value for trend3 | 0.51 | 0.24 | ||
| Parity | ||||
| 0 | 42 (126) | 1.4 (1.1, 1.9) | 33 (99) | 3.3 (2.7, 4.1) |
| 1 | 29 (87) | 1.4 (1.0, 2.0) | 24 (72) | 2.8 (2.2, 3.6) |
| ≥2 | 9 (27) | 1.5 (0.8, 2.9) | 8 (24) | 3.1 (2.0, 4.9) |
| p-value for trend | 0.68 | 0.15 | ||
| Completed education | ||||
| Primary School | 6 (18) | 0.7 (0.3, 1.5) | 4 (12) | 2.2 (1.3, 3.8) |
| Intermediate | 20 (60) | 1.7 (1.2, 2.6) | 18 (54) | 2.9 (2.2, 4.0) |
| Higher | 54 (164) | 1.4 (1.1, 1.8) | 43 (129) | 3.3 (2.7, 3.9) |
| p-value for trend | 0.46 | 0.21 | ||
| Pre-pregnancy BMI | ||||
| <20 | 12 (36) | 2.0 (1.2, 3.4) | 9 (27) | 4.3 (3.0, 6.3) |
| 20–24 | 51 (153) | 1.2 (0.9, 1.5) | 42 (126) | 2.7 (2.3, 3.3) |
| ≥25 | 17 (51) | 2.0 (1.3, 3.2) | 14 (42) | 3.6 (2.7, 5.0) |
| p-value for trend | 0.52 | 0.52 | ||
| Smoking during pregnancy | ||||
| Never | 68 (204) | 1.5 (1.2, 1.8) | 55 (165) | 3.2 (2.7, 3.7) |
| Until pregnancy known | 4 (12) | 1.5 (0.6, 3.8) | 5 (15) | 3.7 (1.9, 7.3) |
| Continued after known | 8 (24) | 1.2 (0.6, 2.3) | 2 (6) | 2.3 (1.5, 3.8) |
| p-value for trend | 0.58 | 0.29 | ||
1
N refers to the number of unique women, while (obs) refers to the number of observations modeled as a function of each predictor
2
Geometric Mean and 95% confidence interval
3
P value based on a quantitative (continuous) term for each variable