| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 11 |
0.9%
|
| 0 | Never | 638 |
53.2%
|
| 1 | Once or twice | 50 |
4.2%
|
| 2 | Several times | 24 |
2%
|
| 3 | Many times | 4 |
0.3%
|
| 7 | Not applicable/Saw no problems | 469 |
39.1%
|
| 9 | Don't know | 4 |
0.3%
|