| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.4%
|
|
| 1 | Every few days | 3 |
1.1%
|
| 2 | Every few weeks | 37 |
14.2%
|
| 3 | Every few months | 119 |
45.6%
|
| 4 | Not at all | 51 |
19.5%
|
| Sysmiss | 50 |
19.2%
|