| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 79 |
13.2%
|
| 2 | Twice | 89 |
14.9%
|
| 3 | Three times or more | 420 |
70.4%
|
| 98 | Don't know | 9 |
1.5%
|
| Sysmiss | 70039 |