| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 9408 |
94.8%
|
| 1 | once or twice | 305 |
3.1%
|
| 2 | 3 to 10 times | 129 |
1.3%
|
| 3 | more than 10 times | 67 |
0.7%
|
| 9 | Don't know/No answer | 12 |
0.1%
|
| Sysmiss | 5 |