| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1 | Mechanical treatment | 13 | 19 |
0.5%
|
| 2 | Chemical treatment | 4 | 14 |
0.4%
|
| 3 | Biological treatment | 7 | 10 |
0.3%
|
| Sysmiss | 895 | 3509 |