| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 2913 |
93.3%
|
| 1 | once or twice | 121 |
3.9%
|
| 2 | 3 to 10 times | 58 |
1.9%
|
| 3 | more than 10 times | 22 |
0.7%
|
| 9 | Don't know/No answer | 4 |
0.1%
|
| Sysmiss | 4 |