| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 552 |
23%
|
| 1 | Once or twice | 280 |
11.7%
|
| 2 | Several times | 278 |
11.6%
|
| 3 | Many times | 108 |
4.5%
|
| 7 | Not applicable/Saw no problems | 1141 |
47.5%
|
| 9 | Don't know | 41 |
1.7%
|
| 998 | Refused | 0 |
0%
|