| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 14 |
1.2%
|
| 0 | Never | 157 |
13.1%
|
| 1 | Once or twice | 70 |
5.8%
|
| 2 | Several times | 59 |
4.9%
|
| 3 | Many times | 27 |
2.3%
|
| 7 | Not applicable/Saw no problems | 857 |
71.4%
|
| 9 | Don't know | 16 |
1.3%
|
| 998 | Refused | 0 |
0%
|