| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 4 |
0.3%
|
| 0 | Never | 544 |
45.3%
|
| 1 | Once or twice | 236 |
19.7%
|
| 2 | Several times | 297 |
24.8%
|
| 3 | Many times | 77 |
6.4%
|
| 7 | Not applicable/Saw no problems | 29 |
2.4%
|
| 9 | Don't know | 13 |
1.1%
|
| 998 | Refused | 0 |
0%
|