| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 2013 |
84.2%
|
| 1 | Once or twice | 178 |
7.4%
|
| 2 | Several times | 89 |
3.7%
|
| 3 | Many times | 40 |
1.7%
|
| 8 | Refused | 10 |
0.4%
|
| 9 | Don't know | 62 |
2.6%
|