| Value | Category | Cases | |
|---|---|---|---|
| -99 | 4 |
1.5%
|
|
| 1 | Every few days | 6 |
2.3%
|
| 2 | Every few weeks | 25 |
9.6%
|
| 3 | Every few months | 69 |
26.4%
|
| 4 | Not at all | 107 |
41%
|
| Sysmiss | 50 |
19.2%
|