| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 1158 |
96.5%
|
| 1 | Once or twice | 14 |
1.2%
|
| 2 | Several times | 19 |
1.6%
|
| 3 | Many times | 6 |
0.5%
|
| 8 | Refused | 1 |
0.1%
|
| 9 | Don't know | 2 |
0.2%
|