| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 2171 |
96.4%
|
| 1 | Yes, once | 56 |
2.5%
|
| 2 | Yes, more than once | 24 |
1.1%
|
| 9 | 32 | ||
| Sysmiss | 2982 |