| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 4 |
0.3%
|
| 0 | Never | 1030 |
85.8%
|
| 1 | Once or twice | 56 |
4.7%
|
| 2 | Several times | 56 |
4.7%
|
| 3 | Many times | 13 |
1.1%
|
| 7 | Not applicable/Saw no problems | 29 |
2.4%
|
| 9 | Don't know | 12 |
1%
|
| 998 | Refused | 0 |
0%
|