| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 16 |
1.3%
|
| 0 | Never | 208 |
17.3%
|
| 1 | Once or twice | 29 |
2.4%
|
| 2 | Several times | 33 |
2.8%
|
| 3 | Many times | 18 |
1.5%
|
| 7 | Not applicable/Saw no problems | 894 |
74.5%
|
| 9 | Don't know | 2 |
0.2%
|
| 998 | Refused | 0 |
0%
|