| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 16 |
1.3%
|
| 0 | Never | 81 |
6.8%
|
| 1 | Once or twice | 63 |
5.3%
|
| 2 | Several times | 100 |
8.3%
|
| 3 | Many times | 45 |
3.8%
|
| 7 | Not applicable/Saw no problems | 894 |
74.5%
|
| 9 | Don't know | 1 |
0.1%
|
| 998 | Refused | 0 |
0%
|