Value | Category | Cases | |
---|---|---|---|
1 | boiling | 169 |
4.2%
|
2 | chlorinating | 12 |
0.3%
|
3 | filtering | 131 |
3.2%
|
4 | without treatment | 3692 |
90.7%
|
5 | other | 31 |
0.8%
|
9 | not stated | 36 |
0.9%
|
Sysmiss | 839 |