| Value | Category | Cases | |
|---|---|---|---|
| -99 | 25 |
5.4%
|
|
| 1 | Every few days | 3 |
0.6%
|
| 2 | Every few weeks | 23 |
5%
|
| 3 | Every few months | 93 |
20%
|
| 4 | Not at all | 269 |
58%
|
| Sysmiss | 51 |
11%
|