| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 900 |
37.5%
|
| 1 | Once or twice | 139 |
5.8%
|
| 2 | Several times | 113 |
4.7%
|
| 3 | Many times | 63 |
2.6%
|
| 7 | Not applicable/Saw no problems | 1141 |
47.5%
|
| 9 | Don't know | 44 |
1.8%
|
| 998 | Refused | 0 |
0%
|