| Value | Category | Cases | |
|---|---|---|---|
| -1 | missing | 0 |
0%
|
| 0 | never | 26586 |
49.7%
|
| 1 | just once or twice | 7733 |
14.5%
|
| 2 | several times | 9301 |
17.4%
|
| 3 | many times | 5835 |
10.9%
|
| 4 | always | 3925 |
7.3%
|
| 8 | refused | 9 |
0%
|
| 9 | don't know | 55 |
0.1%
|