| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 2195 |
97.6%
|
| 1 | Yes, once | 35 |
1.6%
|
| 2 | Yes, more than once | 18 |
0.8%
|
| 9 | 35 | ||
| Sysmiss | 2982 |