| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 200 |
15.8%
|
| 1 | Once or twice | 109 |
8.6%
|
| 2 | Several times | 52 |
4.1%
|
| 3 | Many times | 7 |
0.6%
|
| 7 | Not applicable/Saw no problems | 886 |
70.1%
|
| 9 | Don't know | 10 |
0.8%
|
| 998 | Refused | 0 |
0%
|