| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very dirty | 53 |
12.8%
|
| 2 | Dirty | 120 |
29%
|
| 3 | Average | 168 |
40.6%
|
| 4 | Clean | 70 |
16.9%
|
| 5 | Very clean | 3 |
0.7%
|