| Value |
Category |
| 1 |
once a month |
| 2 |
every 2-5 months |
| 3 |
every 6-11 months |
| 4 |
once per year or less |
| 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.
