| Value | Category | Cases | |
|---|---|---|---|
| -1 | missing | 0 |
0%
|
| 0 | never | 31572 |
59.1%
|
| 1 | just once or twice | 7066 |
13.2%
|
| 2 | several times | 6901 |
12.9%
|
| 3 | many times | 4498 |
8.4%
|
| 4 | always | 3353 |
6.3%
|
| 8 | refused | 4 |
0%
|
| 9 | don't know | 50 |
0.1%
|