| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 40 |
3.3%
|
| 0 | Never | 201 |
16.8%
|
| 1 | Once or twice | 54 |
4.5%
|
| 2 | Several times | 80 |
6.7%
|
| 3 | Many times | 47 |
3.9%
|
| 7 | Not applicable/Saw no problems | 696 |
58%
|
| 9 | Don't know | 82 |
6.8%
|
| 998 | Refused | 0 |
0%
|