| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 130 |
0.5%
|
| 0 | Never | 5263 |
19%
|
| 1 | Once or twice | 2765 |
10%
|
| 2 | Several times | 2803 |
10.1%
|
| 3 | Many times | 1038 |
3.7%
|
| 7 | Not applicable/Saw no problems | 15112 |
54.5%
|
| 9 | Don't know | 602 |
2.2%
|
| 998 | Refused | 0 |
0%
|