| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not at all | 1235 |
29.5%
|
| 2 | Once | 1819 |
43.4%
|
| 3 | Twice | 519 |
12.4%
|
| 4 | Three times | 272 |
6.5%
|
| 5 | More than three times | 343 |
8.2%
|
| -5 | Missing; RU: Inappropriate response | 0 | |
| -4 | Not asked in survey | 13896 | |
| -3 | Not applicable ('Have not done') | 69483 | |
| -2 | No answer | 1942 | |
| -1 | Don't know | 56 |