| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 4 |
0.4%
|
| -8 | Refused | 0 |
0%
|
| -5 | Not applicable | 0 |
0%
|
| -3 | Missing | 0 |
0%
|
| 1 | Once | 237 |
26%
|
| 2 | More than once | 305 |
33.4%
|
| 3 | Never | 367 |
40.2%
|
| Sysmiss | 86 |