| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 2149 |
92.3%
|
| 1 | Yes, once | 107 |
4.6%
|
| 2 | Yes, more than once | 72 |
3.1%
|
| 9 | 26 | ||
| Sysmiss | 2911 |