| Value | Category | Cases | |
|---|---|---|---|
| -99 | 8 |
2.6%
|
|
| 1 | Every few days | 3 |
1%
|
| 2 | Every few weeks | 40 |
12.9%
|
| 3 | Every few months | 159 |
51.5%
|
| 4 | Not at all | 63 |
20.4%
|
| Sysmiss | 36 |
11.7%
|