| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.5%
|
|
| 1 | Every few days | 25 |
12.1%
|
| 2 | Every few weeks | 44 |
21.4%
|
| 3 | Every few months | 93 |
45.1%
|
| 4 | Not at all | 43 |
20.9%
|
| Sysmiss | 19 |