| Value | Category | Cases | |
|---|---|---|---|
| -99 | 14 |
4%
|
|
| 1 | Every few days | 5 |
1.4%
|
| 2 | Every few weeks | 43 |
12.3%
|
| 3 | Every few months | 166 |
47.3%
|
| 4 | Not at all | 88 |
25.1%
|
| Sysmiss | 35 |
10%
|