| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not at all | 4281 |
29.1%
|
| 2 | Once | 5671 |
38.6%
|
| 3 | Twice | 2551 |
17.4%
|
| 4 | Three times | 870 |
5.9%
|
| 5 | More than three times | 1326 |
9%
|
| -5 | Missing; RU: Inappropriate response | 5 | |
| -4 | Not asked in survey | 10145 | |
| -3 | Not applicable ('Have not done') | 62973 | |
| -2 | No answer | 1648 | |
| -1 | Don't know | 95 |