| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1 | Mechanical treatment | 15 | 34 |
1%
|
| 2 | Chemical treatment | 10 | 56 |
1.6%
|
| 3 | Biological treatment | 28 | 39 |
1.1%
|
| Sysmiss | 694 | 3422 |