| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not attached | 816364 |
77.5%
|
| 2 | Attached - 1 side | 173459 |
16.5%
|
| 3 | Attached - 2 side | 53522 |
5.1%
|
| 4 | Attached - 3 side | 9602 |
0.9%
|
| Sysmiss | 1 |