| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 4674 |
95.3%
|
| 1 | Yes, once | 148 |
3%
|
| 2 | Yes, more than once | 85 |
1.7%
|
| 9 | 55 | ||
| Sysmiss | 7857 |