| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 4764 |
97.3%
|
| 1 | Yes, once | 92 |
1.9%
|
| 2 | Yes, more than once | 40 |
0.8%
|
| 9 | 66 | ||
| Sysmiss | 7857 |