| Value |
Category |
| 1 |
No, I do not know |
| 2 |
Every month |
| 3 |
Every 2 months |
| 4 |
Every 3 months |
| 5 |
No-one told me |
| 97 |
Other (specify) |
| 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.