| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 239 |
20.1%
|
| 1 | Just once or twice | 51 |
4.3%
|
| 2 | Several times | 295 |
24.8%
|
| 3 | Many times | 577 |
48.4%
|
| 8 | Refused | 0 |
0%
|
| 9 | Don't know | 29 |
2.4%
|