| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 31375 |
68.5%
|
| 1 | Just once or twice | 4869 |
10.6%
|
| 2 | Several times | 4502 |
9.8%
|
| 3 | Many times | 2578 |
5.6%
|
| 4 | Always | 2423 |
5.3%
|
| 8 | Refused | 15 |
0%
|
| 9 | Don't know | 61 |
0.1%
|