| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.3%
|
|
| 1 | Every few days | 13 |
3.7%
|
| 2 | Every few weeks | 59 |
16.9%
|
| 3 | Every few months | 167 |
47.9%
|
| 4 | Not at all | 74 |
21.2%
|
| Sysmiss | 35 |
10%
|