| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 274 |
23%
|
| 1 | Just once or twice | 56 |
4.7%
|
| 2 | Several times | 312 |
26.2%
|
| 3 | Many times | 519 |
43.6%
|
| 8 | Refused | 0 |
0%
|
| 9 | Don't know | 30 |
2.5%
|