| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 171 |
13.9%
|
| 1 | Once or twice | 77 |
6.3%
|
| 2 | Several times | 98 |
8%
|
| 3 | Many times | 45 |
3.7%
|
| 7 | Not applicable/Saw no problems | 839 |
68.1%
|
| 9 | Don't know | 2 |
0.2%
|
| 998 | Refused | 0 |
0%
|