| Value |
Category |
| 1 |
1. Never |
| 2 |
2. >= 1* year |
| 3 |
3. >= 1* mnth |
| 4 |
4. >= 1* week |
| 5 |
5. Daily |
| 9 |
9. Miss |
| 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.