| Value | Category | Cases | |
|---|---|---|---|
| -99 | 3 |
1.1%
|
|
| 1 | Every few days | 5 |
1.9%
|
| 2 | Every few weeks | 42 |
16.1%
|
| 3 | Every few months | 107 |
41%
|
| 4 | Not at all | 54 |
20.7%
|
| Sysmiss | 50 |
19.2%
|