| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 1618 |
94%
|
| 2 | Boiled | 19 |
1.1%
|
| 3 | Filtered | 3 |
0.2%
|
| 4 | Treated/Chlorinated | 71 |
4.1%
|
| 97 | Refused | 0 |
0%
|
| 98 | Don't know | 0 |
0%
|
| 99 | Missing | 10 |
0.6%
|
| Sysmiss | 4 |