| Value | Category | Cases | |
|---|---|---|---|
| -99 | 2 |
1%
|
|
| 1 | Every few days | 18 |
8.7%
|
| 2 | Every few weeks | 40 |
19.4%
|
| 3 | Every few months | 100 |
48.5%
|
| 4 | Not at all | 46 |
22.3%
|
| Sysmiss | 19 |