| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1 | Mechanical treatment | 9 | 13 |
0.4%
|
| 2 | Chemical treatment | 4 | 5 |
0.2%
|
| 3 | Biological treatment | 5 | 9 |
0.3%
|
| Sysmiss | 842 | 3255 |