Value |
Category |
1 |
per month |
2 |
Once per 3 months |
3 |
Once every 6 months |
4 |
Once a year or less |
5 |
Not once |
6 |
I do not know |
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.