| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 134 |
0.5%
|
| 0 | Never | 9364 |
33.8%
|
| 1 | Once or twice | 1240 |
4.5%
|
| 2 | Several times | 858 |
3.1%
|
| 3 | Many times | 350 |
1.3%
|
| 7 | Not applicable/Saw no problems | 15112 |
54.5%
|
| 9 | Don't know | 655 |
2.4%
|
| 998 | Refused | 0 |
0%
|