| OBSP Statistical Summary for 2-(2,4,5-TRICHLOROPHENOXY) PROPIONIC ACID (SILVEX) |
| Spike Level | Range | N | Mean | Std-Dev. | Median | F_Pseudo |
| ULTRA-LOW | 0.035-0.1 | 20 | 96% | 18% | 94% | 18% |
| LOW | 0.1-0.4 | 9 | 83% | 8% | 82% | 2% |
| MEDIUM | 0.4-1.0 | 5 | 86% | 14% | 86% | 6% |
| HIGH | 1.0-2.0 | 6 | 80% | 10% | 84% | 11% |