| Value | Category | Cases | |
|---|---|---|---|
| -1 | missing | 0 |
0%
|
| 0 | never | 38115 |
79.3%
|
| 1 | once or twice | 4716 |
9.8%
|
| 2 | several times | 2965 |
6.2%
|
| 3 | often | 1271 |
2.6%
|
| 8 | refused | 101 |
0.2%
|
| 9 | don’t know | 916 |
1.9%
|