| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 470 |
19.6%
|
| 2 | Once or twice | 296 |
12.3%
|
| 3 | Several times | 267 |
11.1%
|
| 4 | Many times | 89 |
3.7%
|
| 5 | Not Applicable/Saw no problems | 1274 |
53.1%
|
| 9 | Don't know | 3 |
0.1%
|