| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 3 |
0.3%
|
| 0 | Never | 635 |
52.9%
|
| 1 | Once or twice | 227 |
18.9%
|
| 2 | Several times | 229 |
19.1%
|
| 3 | Many times | 64 |
5.3%
|
| 7 | Not applicable/Saw no problems | 29 |
2.4%
|
| 9 | Don't know | 13 |
1.1%
|
| 998 | Refused | 0 |
0%
|