| Value | Category | Cases | |
|---|---|---|---|
| 0 | 4 |
0.4%
|
|
| 1 | 193 |
18.4%
|
|
| 2 | 715 |
68.3%
|
|
| 888 | 3 |
0.3%
|
|
| 999 | 132 |
12.6%
|
|
| Sysmiss | 648 |