| Value | Category | Cases | |
|---|---|---|---|
| 1 | Free | 2381 |
94.7%
|
| 2 | Pressure | 44 |
1.7%
|
| 3 | Did not | 77 |
3.1%
|
| 4 | Could no | 13 |
0.5%
|
| Sysmiss | 2 |