| Value | Category | Cases | |
|---|---|---|---|
| -99 | 3 |
1.9%
|
|
| 1 | Every few days | 14 |
8.9%
|
| 2 | Every few weeks | 36 |
22.8%
|
| 3 | Every few months | 61 |
38.6%
|
| 4 | Not at all | 24 |
15.2%
|
| Sysmiss | 20 |
12.7%
|