| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 2100 |
87.5%
|
| 1 | Once or twice | 154 |
6.4%
|
| 2 | Several times | 75 |
3.1%
|
| 3 | Often | 32 |
1.3%
|
| 8 | Refused | 3 |
0.1%
|
| 9 | Don’t know | 36 |
1.5%
|