| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 1 |
0.1%
|
| 0 | Never | 490 |
40.6%
|
| 1 | Once or twice | 19 |
1.6%
|
| 2 | Several times | 14 |
1.2%
|
| 3 | Many times | 7 |
0.6%
|
| 7 | Not applicable/Saw no problems | 673 |
55.7%
|
| 9 | Don't know | 4 |
0.3%
|
| 998 | Refused | 0 |
0%
|