| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 1871 |
59.9%
|
| 1 | once or twice | 509 |
16.3%
|
| 2 | 3 to 10 times | 422 |
13.5%
|
| 3 | more than 10 times | 314 |
10.1%
|
| 9 | Don't know/No answer | 2 |
0.1%
|
| Sysmiss | 4 |