| Value | Category | Cases | |
|---|---|---|---|
| -1 | missing | 0 |
0%
|
| 0 | never | 18912 |
39.3%
|
| 1 | just once or twice | 7698 |
16%
|
| 2 | several times | 10845 |
22.6%
|
| 3 | many times | 7222 |
15%
|
| 4 | always | 3232 |
6.7%
|
| 8 | refused | 21 |
0%
|
| 9 | don't know | 154 |
0.3%
|