| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 46 |
3.8%
|
| 0 | Never | 365 |
30.4%
|
| 1 | Once or twice | 8 |
0.7%
|
| 2 | Several times | 1 |
0.1%
|
| 3 | Many times | 1 |
0.1%
|
| 7 | Not applicable/Saw no problems | 696 |
58%
|
| 9 | Don't know | 83 |
6.9%
|
| 998 | Refused | 0 |
0%
|