| Value |
Category |
| -99 |
Don't know |
| -96 |
Other |
| 1 |
One time only |
| 2 |
Once a month |
| 3 |
Several times a month |
| 4 |
Twice a year |
| 5 |
Ongoing |
| 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.