| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 42 |
3.5%
|
| 0 | Never | 120 |
10%
|
| 1 | Once or twice | 9 |
0.8%
|
| 2 | Several times | 5 |
0.4%
|
| 3 | Many times | 5 |
0.4%
|
| 7 | Not applicable/Saw no problems | 1011 |
84.3%
|
| 9 | Don't know | 8 |
0.7%
|
| 998 | Refused | 0 |
0%
|