| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 5386 |
96.4%
|
| 1 | Yes, once | 131 |
2.3%
|
| 2 | Yes, more than once | 68 |
1.2%
|
| 9 | 72 | ||
| Sysmiss | 25422 |