Table 2.
Distribution of maternal PCB concentrations (μg/L).
| Percentile distributions
|
|||||
|---|---|---|---|---|---|
| Exposure category | No. | 25 | 50 | 75 | Mean ± SD |
| ∑PCBalla | 150 | 6.8 | 8.4 | 10.4 | 9.2 ± 3.5 |
| PCB-15 (coplanar) | 135 | 0.5 | 1.0 | 1.7 | 1.2 ± 0.8 |
| ∑PCBmonob | 150 | 2.3 | 2.8 | 3.5 | 3.1 ± 1.3 |
| ∑PCBdic | 150 | 3.0 | 3.6 | 5.0 | 4.2 ± 2.0 |
| ∑PCBtrid | 150 | 0.5 | 0.7 | 1.0 | 0.8 ± 0.5 |
Abbreviations: ∑PCBall, sum of all PCBs; ∑PCBdi, sum of di-ortho-substituted PCBs; ∑PCBmono, sum of mono-ortho-substituted PCBs; ∑PCBtri, sum of tri-ortho-substituted PCBs.
a
PCB congeners summed into ∑PCBall: 15, 28, 56, 66, 74, 99, 101, 105, 118, 138, 146, 153, 156, 167, 170, 174, 180, 183, 187, 199, 203.
b
PCB congeners summed into PCBmono: 28, 56, 66, 74, 105, 118, 156, 167.
c
PCB congeners summed into PCBdi: 99, 101, 138, 146, 153, 170, 180.
d
PCB congeners summed into PCBtr: 174, 183, 187, 199, 203.