| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.8%
|
|
| 1 | Every few days | 15 |
12.1%
|
| 2 | Every few weeks | 32 |
25.8%
|
| 3 | Every few months | 53 |
42.7%
|
| 4 | Not at all | 23 |
18.5%
|
| Sysmiss | 20 |