| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 5903 |
93.7%
|
| 1 | Yes, once | 239 |
3.8%
|
| 2 | Yes, more than once | 156 |
2.5%
|
| 9 | 20 | ||
| Sysmiss | 2126 |