| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 8915 |
81.9%
|
| 2 | Once | 870 |
8%
|
| 3 | A few times | 701 |
6.4%
|
| 4 | Many times | 404 |
3.7%
|
| Sysmiss | 26 |