| Value | Category | Cases | |
|---|---|---|---|
| -99 | 28 |
6%
|
|
| 1 | Every few days | 4 |
0.9%
|
| 2 | Every few weeks | 23 |
5%
|
| 3 | Every few months | 102 |
22%
|
| 4 | Not at all | 261 |
56.3%
|
| Sysmiss | 46 |
9.9%
|