| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very dirty | 2 |
0.6%
|
| 2 | Dirty | 80 |
23.3%
|
| 3 | Same as other | 156 |
45.5%
|
| 4 | Clean | 103 |
30%
|
| 5 | Very clean | 2 |
0.6%
|