| Value | Category | Cases | |
|---|---|---|---|
| 1 | Open burning | 46 |
2.4%
|
| 2 | Buried | 3 |
0.2%
|
| 3 | Chemical treatment | 9 |
0.5%
|
| 4 | Others, specify | 9 |
0.5%
|
| 5 | 3 |
0.2%
|
|
| Sysmiss | 1880 |