| Value |
Category |
| -99 |
Don't know |
| -98 |
Refuse to answer |
| -95 |
|
| 0 |
Only once or seldom |
| 1 |
Day |
| 2 |
Week |
| 3 |
Every two weeks |
| 4 |
Month |
| 5 |
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.