| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 494 |
20.3%
|
| 1 | Once or twice | 420 |
17.3%
|
| 2 | Several times | 342 |
14.1%
|
| 3 | Many times | 93 |
3.8%
|
| 7 | Not applicable/Saw no problems | 1059 |
43.6%
|
| 9 | Don't know | 23 |
0.9%
|
| 998 | Refused | 0 |
0%
|