| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not at all | 1543 |
31.2%
|
| 2 | Once | 2139 |
43.2%
|
| 3 | Twice | 625 |
12.6%
|
| 4 | Three times | 214 |
4.3%
|
| 5 | More than three times | 426 |
8.6%
|
| -5 | Missing; RU: Inappropriate response | 0 | |
| -4 | Not asked in survey | 11448 | |
| -3 | Not applicable ('Have not done') | 71622 | |
| -2 | No answer | 1506 | |
| -1 | Don't know | 42 |