| Value | Category | Cases | |
|---|---|---|---|
| 1 | boiling | 133 |
2.9%
|
| 2 | boiling chlorination | 46 |
1%
|
| 3 | boiling chlorination filter | 16 |
0.4%
|
| 4 | boiling filter | 14 |
0.3%
|
| 5 | boiling safe | 3 |
0.1%
|
| 6 | chlorination | 205 |
4.5%
|
| 7 | chlorination filter | 7 |
0.2%
|
| 8 | chlorination filter none | 1 |
0%
|
| 9 | chlorination none | 3 |
0.1%
|
| 10 | chlorination safe | 2 |
0%
|
| 11 | filter | 316 |
6.9%
|
| 12 | none | 827 |
18.1%
|
| 13 | other | 9 |
0.2%
|
| 14 | safe | 657 |
14.4%
|
| 15 | safe none | 1 |
0%
|
| Missing value | 2329 |
51%
|