| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 637 |
53.1%
|
| 1 | Once or twice | 204 |
17%
|
| 2 | Several times | 240 |
20%
|
| 3 | Many times | 107 |
8.9%
|
| 8 | Refused | 0 |
0%
|
| 9 | Don't know | 12 |
1%
|