| The used oil (μl/ml) | 11 μl/30 ml | 12 μl/30 ml | 13 μl/30 ml | 14 μl/30 ml | 15 μl/30 ml | 16 μl/30 ml | 17 μl/30 ml |
| The used oil (%) | 0.037% | 0.04% | 0.043% | 0.047% | 0.05% | 0.053% | 0.057% |
| M. piperta oil | 232 ± 1 | 227 ± 3 | 222 ± 1 | 217 ± 3 | 209 ± 1 | 198 ± 1 | 198 ± 1 |
| Negative control | 286 ± 3 | 286 ± 1 | 286 ± 3 | 286 ± 3 | 286 ± 4 | 286 ± 1 | 286 ± 1 |
| Positive control | 233 ± 1 | 233 ± 1 | 233 ± 1 | 233 ± 1 | 233 ± 1 | 233 ± 1 | 233 ± 1 |