| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 171 |
14.3%
|
| 1 | Once or twice | 124 |
10.3%
|
| 2 | Several times | 105 |
8.8%
|
| 3 | Many times | 64 |
5.3%
|
| 7 | Not applicable/Saw no problems | 734 |
61.2%
|
| 9 | Don't know | 2 |
0.2%
|
| 998 | Refused | 0 |
0%
|