| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 356 |
15.3%
|
| 1 | Once or twice | 314 |
13.5%
|
| 2 | Several times | 354 |
15.2%
|
| 3 | Many times | 118 |
5.1%
|
| 7 | Not applicable/Saw no problems | 1140 |
49.1%
|
| 9 | Don't know | 42 |
1.8%
|
| 998 | Refused | 0 |
0%
|