Table 1.
Percent detections and concentrations (ng/g) of persistent organochlorine compounds measured in carpet dust, among controls (n = 212)a
| Compound | Method DL (ng/g) | Percent > DL | Geometric mean (ng/g)b | Geometric SD | Arithmetic mean (ng/g)b | Arithmetic SD |
|---|---|---|---|---|---|---|
| Total PCBs | — | 64.6 | 5.63 | 4.65 | 16.23 | 32.05 |
| PCB-105 | 1 | 11.3 | — | — | — | — |
| PCB-118 | 1 | 29.2 | 0.3 | 13.0 | 3.69 | 9.87 |
| PCB-138 | 1 | 48.1 | 1.0 | 6.9 | 6.84 | 17.10 |
| PCB-153 | 1 | 48.6 | 1.0 | 5.7 | 5.77 | 17.50 |
| PCB-170 | 2 | 7.1 | — | — | — | — |
| PCB-180 | 2 | 36.8 | 1.2 | 3.5 | 3.81 | 11.28 |
| α-Chlordane | 2 | 94.8 | 9.7 | 4.1 | 33.22 | 91.35 |
| γ-Chlordane | 2 | 95.3 | 11.3 | 3.9 | 35.94 | 90.72 |
| DDE | 2 | 81.6 | 9.4 | 4.3 | 23.82 | 42.93 |
| DDT | 10 | 56.6 | 16.0 | 7.9 | 78.82 | 169.49 |
| Lindane | 10 | 5.7 | — | — | — | |
| Dieldrin | 50 | 6.6 | — | — | — | |
| Methoxychlor | 10 | 23.6 | 36.4 | 4.2 | 31.34 | 183.88 |
| Pentachlorophenol | 5 | 93.9 | 77.0 | 3.2 | 199.27 | 707.87 |
a
Dust samples taken with the HVS3 vacuum in the room where the child spent the most time.
b
Calculated assuming a log normal distribution and using the LIFEREG procedure in SAS.