| Scale | Mean Scale | Category Scale |
| 0 - 2 | 1.00 till 2.99 | Fade |
| 3 - 5 | 3.00 till 5.99 | Began to fade |
| 6 - 8 | 6.00 till 8.99 | Still remains |
| 9 - 10 | 9.00 till 10.00 | Remains |