| Value | Category | Cases | |
|---|---|---|---|
| -99 | 14 |
4%
|
|
| 1 | Every few days | 8 |
2.3%
|
| 2 | Every few weeks | 29 |
8.3%
|
| 3 | Every few months | 119 |
33.9%
|
| 4 | Not at all | 143 |
40.7%
|
| Sysmiss | 38 |
10.8%
|