| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 6074 |
96.5%
|
| 1 | Yes, once | 127 |
2%
|
| 2 | Yes, more than once | 94 |
1.5%
|
| 9 | 23 | ||
| Sysmiss | 2126 |