| Value | Category | Cases | |
|---|---|---|---|
| -99 | 11 |
4.3%
|
|
| 1 | Every few days | 2 |
0.8%
|
| 2 | Every few weeks | 21 |
8.2%
|
| 3 | Every few months | 69 |
27%
|
| 4 | Not at all | 124 |
48.4%
|
| Sysmiss | 29 |
11.3%
|