| Value | Category | Cases | |
|---|---|---|---|
| -1 | missing | 0 |
0%
|
| 0 | never | 26029 |
54.1%
|
| 1 | just once or twice | 6567 |
13.7%
|
| 2 | several times | 7748 |
16.1%
|
| 3 | many times | 4693 |
9.8%
|
| 4 | always | 2925 |
6.1%
|
| 8 | refused | 11 |
0%
|
| 9 | don't know | 111 |
0.2%
|