| Value | Category | Cases | |
|---|---|---|---|
| -99 | 4 |
2.5%
|
|
| 1 | Every few days | 11 |
7%
|
| 2 | Every few weeks | 24 |
15.2%
|
| 3 | Every few months | 35 |
22.2%
|
| 4 | Not at all | 64 |
40.5%
|
| Sysmiss | 20 |
12.7%
|