| Dose | Mean | n | S.E. |
|
| 0 | 8.84 | 3 | 0.35 | A |
| 20 | 10.96 | 3 | 0.35 | B |
| 200 | 10.29 | 3 | 0.35 | B |
| 2000 | 10.30 | 3 | 0.35 | B |