| Value |
Category |
| 1 |
Once every month |
| 2 |
Once every 2 months |
| 3 |
Once every 3 months |
| 97 |
Other |
| 98 |
DK |
| 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.
