| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 695 |
29%
|
| 2 | Once or twice | 198 |
8.3%
|
| 3 | Several times | 152 |
6.3%
|
| 4 | Many times | 59 |
2.5%
|
| 5 | Not Applicable/Saw no problems | 1286 |
53.6%
|
| 9 | Don't know | 9 |
0.4%
|