| Value | Category | Cases | |
|---|---|---|---|
| -1 | missing | 0 |
0%
|
| 0 | never | 23115 |
43.3%
|
| 1 | just once or twice | 7252 |
13.6%
|
| 2 | several times | 10219 |
19.1%
|
| 3 | many times | 7644 |
14.3%
|
| 4 | always | 5173 |
9.7%
|
| 8 | refused | 9 |
0%
|
| 9 | don't know | 32 |
0.1%
|