| Dose | Mean | n | S.E. |
|
| 0 | 11.93 | 3 | 0.10 | A |
| 20 | 14.80 | 3 | 0.10 | C |
| 200 | 15.16 | 3 | 0.10 | D |
| 2000 | 13.21 | 3 | 0.10 | B |