| Value |
Category |
| 1 |
ultraviolet rays/ resin / reverse osmosis |
| 2 |
boiling |
| 3 |
filter |
| 4 |
cloth screen |
| 5 |
any disinfectant |
| 9 |
others |
| 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.