| Value |
Category |
| -99 |
Don't know |
| 1 |
Per day |
| 2 |
Per week |
| 3 |
Per month |
| 4 |
Per 3 months |
| 5 |
Per 6 months |
| 6 |
Per year |
| 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.