| Value | Category | Cases | |
|---|---|---|---|
| -99 | 11 |
2.4%
|
|
| 1 | Every few days | 13 |
2.8%
|
| 2 | Every few weeks | 65 |
14%
|
| 3 | Every few months | 192 |
41.4%
|
| 4 | Not at all | 141 |
30.4%
|
| Sysmiss | 42 |
9.1%
|