| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 1011 |
42.1%
|
| 1 | Just once or twice | 509 |
21.2%
|
| 2 | Several times | 496 |
20.7%
|
| 3 | Many times | 295 |
12.3%
|
| 4 | Always | 87 |
3.6%
|
| 8 | Refused | 1 |
0%
|
| 9 | Don't know | 1 |
0%
|