| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 860 |
36%
|
| 1 | Just once or twice | 513 |
21.4%
|
| 2 | Several times | 642 |
26.8%
|
| 3 | Many times | 265 |
11.1%
|
| 4 | Always | 82 |
3.4%
|
| 8 | Refused | 10 |
0.4%
|
| 9 | Don't know | 20 |
0.8%
|