| Value | Category | Cases | |
|---|---|---|---|
| -99 | 9 |
3.5%
|
|
| 1 | Every few days | 7 |
2.7%
|
| 2 | Every few weeks | 23 |
9%
|
| 3 | Every few months | 34 |
13.3%
|
| 4 | Not at all | 152 |
59.4%
|
| Sysmiss | 31 |
12.1%
|