| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 326 |
27.2%
|
| 1 | Once or twice | 49 |
4.1%
|
| 2 | Several times | 37 |
3.1%
|
| 3 | Many times | 42 |
3.5%
|
| 7 | Not applicable/Saw no problems | 745 |
62.1%
|
| 9 | Don't know | 1 |
0.1%
|
| 998 | Refused | 0 |
0%
|