| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 15 |
1.3%
|
| 0 | Never | 134 |
11.2%
|
| 1 | Once or twice | 77 |
6.4%
|
| 2 | Several times | 73 |
6.1%
|
| 3 | Many times | 27 |
2.3%
|
| 7 | Not applicable/Saw no problems | 857 |
71.4%
|
| 9 | Don't know | 17 |
1.4%
|
| 998 | Refused | 0 |
0%
|