| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 146 |
12.2%
|
| 1 | Once or twice | 8 |
0.7%
|
| 2 | Several times | 7 |
0.6%
|
| 3 | Many times | 8 |
0.7%
|
| 7 | Not applicable/Saw no problems | 966 |
80.5%
|
| 9 | Don't know | 65 |
5.4%
|
| 998 | Refused | 0 |
0%
|