| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 16 |
1.3%
|
| 0 | Never | 173 |
14.4%
|
| 1 | Once or twice | 36 |
3%
|
| 2 | Several times | 56 |
4.7%
|
| 3 | Many times | 24 |
2%
|
| 7 | Not applicable/Saw no problems | 894 |
74.5%
|
| 9 | Don't know | 1 |
0.1%
|
| 998 | Refused | 0 |
0%
|