| Value |
Category |
| -9 |
|
| 1 |
never |
| 2 |
annually |
| 3 |
half-annually |
| 4 |
quarterly |
| 5 |
monthly |
| 6 |
weekly |
| 7 |
daily |
| 8 |
hourly |
| 10 |
other |
| 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.