Table 1.
Summary percentage of pyrethroids measured from floor wipes in the CCC Study in the top 10% of the centers (in terms of total loading), mixing ratios for two reference mixtures and relative potency estimates from Wolansky et al. where delta/tralomethrin was used as the index chemical.
| Chemical | Average percent in top 10% of CCC Study Centers | Normalized for top 6 to sum to 100* (5 chemical mixture) | Mixing Proportions for 11 chemical mixture* | Relative Potency Estimates** |
|---|---|---|---|---|
| Cyfluthrin | 12.4 | 12.8 | 0.49 | 1.136 |
| Cypermethrin | 27.8 | 28.7 | 2.34 | 0.235 |
| Deltamethrin/tralomethrin | 3.2 | 3.4 | 0.55 | 1.00 |
| Esfenvalerate | 2.6 | 2.7 | 0.26 | 2.092 |
| Cis-permethrin | 19.1 | 52.3 | 9.31 | 0.059 |
| trans-permethrin | 31.3 | |||
| cis-allothrin | 0.6 | 0 | 0 | Set at 1.0 |
| trans-allothrin | <1 | 0 | 0 | Set at 1.0 |
| Bifenthrin | <1 | 0 | 0.70 | 0.782 |
| Cyhalothrin | 1.9 | 0 | 0.29 | 1.902 |
| Pyrethrin I | <1 | 0 | 0 | Set at 1.0 |
| Pyrethrin II | <1 | 0 | 0 | Set at 1.0 |
| Resmethrin | <1 | 0 | 64.10 | 0.009 |
| Sumimethrin | <1 | 0 | 0 | Set at 1.0 |
| Tetramethrin | <1 | 0 | 0 | Set at 1.0 |
| S-Bioallethrin | 0 | 19.82 | 0.028 | |
| Fenpropathrin | 0 | 1.69 | 0.326 | |
| Telfluthrin | 0 | 0.49 | 1.111 |