| Value | Category | Cases | |
|---|---|---|---|
| 1 | PSES-Bottom quarter | 13214 |
22.6%
|
| 2 | PSES-Middle half | 28489 |
48.8%
|
| 3 | PSES-Top quarter | 16672 |
28.6%
|
| Sysmiss | 3021 |