Table 1.
Cord blood BPA concentrations (ng/mL) in relation to the characteristics of mothers and infants.
| N (%) or Mean ± SD | BPA (ng/mL) | |||
|---|---|---|---|---|
| Median (25th, 75th) or correlation (ρ) | p-value | |||
| Maternal Characteristics | ||||
| Maternal Age (year)a | 30.0 ± 4.9 | ρ = −0.031 | 0.613 | |
| Prenatal-BMI (kg/m2)a | 20.9 ± 2.9 | ρ = −0.031 | 0.605 | |
| Parityb | 0 | 145 (52.3) | 0.054 (0.020, 0.076) | 0.407 |
| ≧1 | 132 (47.7) | 0.047 (0.020, 0.074) | ||
| Educational level (year)b | ||||
| ≦12 | 123 (44.4) | 0.050 (0.020, 0.076) | 0.990 | |
| >12 | 154 (55.6) | 0.052 (0.020, 0.070) | ||
| Annual household income (million yen)c | ||||
| <3 | 51 (18.5) | 0.055 (0.020, 0.072) | 0.829 | |
| 3–5 | 144 (52.4) | 0.053 (0.020, 0.076) | ||
| 5–7 | 59 (21.5) | 0.048 (0.020, 0.068) | ||
| >7 | 21 (7.6) | 0.044 (0.020, 0.085) | ||
| Smoking during pregnancyb | ||||
| No | 234 (84.5) | 0.051 (0.020, 0.075) | 0.941 | |
| Yes | 43 (15.5) | 0.056 (0.020, 0.072) | ||
| Alcohol consumption during pregnancyb | ||||
| No | 183 (66.1) | 0.052 (0.020, 0.075) | 0.831 | |
| Yes | 94 (33.9) | 0.047 (0.020, 0.075) | ||
| Caffeine intake during pregnancy (mg/day)a | ||||
| 148.7 ± 121.9 | ρ = −0.012 | 0.843 | ||
| Infant Characteristic | ||||
| Gestation age (week)a | 39.8 ± 1.0 | ρ = −0.003 | 0.964 | |
| Sexb | Male | 123 (44.4) | 0.056 (0.020, 0.075) | 0.429 |
| Female | 154 (55.6) | 0.047 (0.020, 0.073) | ||
| Birth weight (g)a | 3131.3 ± 333.5 | ρ = 0.060 | 0.324 | |
aSpearman’s correlation test (ρ), bMann-Whitney U-test, cKruskal-Wallis test.