| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 199 |
16.2%
|
| 1 | Once or twice | 59 |
4.8%
|
| 2 | Several times | 86 |
7%
|
| 3 | Many times | 46 |
3.7%
|
| 7 | Not applicable/Saw no problems | 839 |
68.1%
|
| 9 | Don't know | 3 |
0.2%
|
| 998 | Refused | 0 |
0%
|