| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 10 |
0.8%
|
| 0 | Never | 659 |
54.9%
|
| 1 | Once or twice | 38 |
3.2%
|
| 2 | Several times | 18 |
1.5%
|
| 3 | Many times | 1 |
0.1%
|
| 7 | Not applicable/Saw no problems | 469 |
39.1%
|
| 9 | Don't know | 5 |
0.4%
|