| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 1500 |
62.5%
|
| 1 | Just once or twice | 317 |
13.2%
|
| 2 | Several times | 310 |
12.9%
|
| 3 | Many times | 156 |
6.5%
|
| 4 | Always | 107 |
4.5%
|
| 8 | Refused | 1 |
0%
|
| 9 | Don't know | 9 |
0.4%
|