| Value | Category | Cases | |
|---|---|---|---|
| -99 | 28 |
6%
|
|
| 1 | Every few days | 6 |
1.3%
|
| 2 | Every few weeks | 40 |
8.6%
|
| 3 | Every few months | 169 |
36.4%
|
| 4 | Not at all | 169 |
36.4%
|
| Sysmiss | 52 |
11.2%
|