| Dose | Mean | n | S.E. |
|
| 0 | 10.88 | 3 | 0.26 | A |
| 20 | 12.81 | 3 | 0.26 | B |
| 200 | 12.55 | 3 | 0.26 | B |
| 2000 | 12.18 | 3 | 0.26 | B |