| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 2 |
0.2%
|
| 0 | Never | 541 |
49%
|
| 1 | Once or twice | 89 |
8.1%
|
| 2 | Several times | 33 |
3%
|
| 3 | Many times | 14 |
1.3%
|
| 7 | Not applicable/Saw no problems | 418 |
37.9%
|
| 9 | Don't know | 7 |
0.6%
|
| 998 | Refused | 0 |
0%
|