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Terzis grooming test.
| Grade | Performance in the grooming test | Score |
| 0 | Rats without any reaction. | 0 |
| 1 | Rats can elbow but cannot touch their nose. | 1 |
| 2 | Rats can elbow and touch their nose. | 2 |
| 3 | Rats can elbow to the position below their eyes. | 3 |
| 4 | Rats can elbow to their eyes. | 4 |
| 5 | Rats can elbow to their ear or the back position of ears. | 5 |
