| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 101 |
0.9%
|
| -8 | Refused | 1 |
0%
|
| -5 | Not applicable | 0 |
0%
|
| -3 | Missing | 0 |
0%
|
| 1 | Once | 3422 |
30.6%
|
| 2 | More than once | 3918 |
35%
|
| 3 | Never | 3739 |
33.4%
|
| Sysmiss | 1201 |