| Value | Category | Cases | |
|---|---|---|---|
| -1 | missing | 0 |
0%
|
| 0 | never | 26789 |
50.1%
|
| 1 | just once or twice | 8662 |
16.2%
|
| 2 | several times | 9748 |
18.2%
|
| 3 | many times | 5592 |
10.5%
|
| 4 | always | 2571 |
4.8%
|
| 8 | refused | 7 |
0%
|
| 9 | don't know | 75 |
0.1%
|