| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 1037 |
86.4%
|
| 1 | Once or twice | 43 |
3.6%
|
| 2 | Several times | 78 |
6.5%
|
| 3 | Many times | 34 |
2.8%
|
| 8 | Refused | 5 |
0.4%
|
| 9 | Don't know | 3 |
0.3%
|