| Value | Category | Cases | |
|---|---|---|---|
| -99 | 16 |
2.3%
|
|
| 1 | Every few days | 113 |
16.4%
|
| 2 | Every few weeks | 172 |
24.9%
|
| 3 | Every few months | 247 |
35.7%
|
| 4 | Not at all | 143 |
20.7%
|
| Sysmiss | 60 |