| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 2030 |
84.6%
|
| 1 | Just once or twice | 194 |
8.1%
|
| 2 | Several times | 114 |
4.8%
|
| 3 | Many times | 39 |
1.6%
|
| 4 | Always | 15 |
0.6%
|
| 8 | Refused | 4 |
0.2%
|
| 9 | Don't know | 4 |
0.2%
|