| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 1909 |
80.3%
|
| 1 | Once or twice | 210 |
8.8%
|
| 2 | Several times | 99 |
4.2%
|
| 3 | Many times | 149 |
6.3%
|
| 8 | Refused | 1 |
0%
|
| 9 | Don't know | 10 |
0.4%
|