| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 1056 |
43.4%
|
| 1 | Once or twice | 170 |
7%
|
| 2 | Several times | 76 |
3.1%
|
| 3 | Many times | 37 |
1.5%
|
| 7 | Not applicable/Saw no problems | 1059 |
43.6%
|
| 9 | Don't know | 33 |
1.4%
|
| 998 | Refused | 0 |
0%
|