| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 1539 |
64.1%
|
| 1 | Once or twice | 335 |
14%
|
| 2 | Several times | 336 |
14%
|
| 3 | Many times | 167 |
7%
|
| 8 | Refused | 0 |
0%
|
| 9 | Don't know | 23 |
1%
|