| Value |
Category |
| 1 |
None |
| 2 |
Boiled |
| 3 |
Filtered |
| 4 |
Treated/Chlorinated |
| 97 |
Refused |
| 98 |
Don't know |
| 99 |
Missing |
| Sysmiss |
|
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.