| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 102 |
0.8%
|
| -8 | Refused | 0 |
0%
|
| -5 | Not applicable | 0 |
0%
|
| -3 | Missing | 11 |
0.1%
|
| 1 | Once | 3682 |
28.3%
|
| 2 | More than once | 4745 |
36.4%
|
| 3 | Never | 4492 |
34.5%
|
| Sysmiss | 939 |