| Value | Category | Cases | |
|---|---|---|---|
| -99 | 8 |
2.6%
|
|
| 1 | Every few days | 5 |
1.6%
|
| 2 | Every few weeks | 33 |
10.7%
|
| 3 | Every few months | 93 |
30.1%
|
| 4 | Not at all | 134 |
43.4%
|
| Sysmiss | 36 |
11.7%
|