| Value | Category | Cases | |
|---|---|---|---|
| -99 | 4 |
2.5%
|
|
| 1 | Every few days | 10 |
6.3%
|
| 2 | Every few weeks | 36 |
22.8%
|
| 3 | Every few months | 50 |
31.6%
|
| 4 | Not at all | 38 |
24.1%
|
| Sysmiss | 20 |
12.7%
|