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.