| Value | Category | Cases | |
|---|---|---|---|
| -1 | missing | 0 |
0%
|
| 0 | never | 21839 |
45.4%
|
| 1 | just once or twice | 6215 |
12.9%
|
| 2 | several times | 8885 |
18.5%
|
| 3 | many times | 6865 |
14.3%
|
| 4 | always | 4203 |
8.7%
|
| 8 | refused | 12 |
0%
|
| 9 | don't know | 65 |
0.1%
|