| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 4 |
1.8%
|
| 2 | Every few weeks | 17 |
7.6%
|
| 3 | Every few months | 67 |
29.8%
|
| 4 | Not at all | 137 |
60.9%
|
| -99 | 6 | ||
| Sysmiss | 29 |