| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 103 |
0.8%
|
| -8 | Refused | 0 |
0%
|
| -5 | Not applicable | 0 |
0%
|
| -3 | Missing | 2 |
0%
|
| 1 | Once | 3685 |
28.2%
|
| 2 | More than once | 4753 |
36.4%
|
| 3 | Never | 4502 |
34.5%
|
| Sysmiss | 873 |