| Value | Category | Cases | |
|---|---|---|---|
| -99 | 56 |
14.2%
|
|
| 1 | Every few days | 15 |
3.8%
|
| 2 | Every few weeks | 16 |
4.1%
|
| 3 | Every few months | 87 |
22%
|
| 4 | Not at all | 140 |
35.4%
|
| Sysmiss | 81 |
20.5%
|