| Value | Category | Cases | |
|---|---|---|---|
| 0 | ??? | 0 |
0%
|
| 1 | Normal | 251 |
98%
|
| 2 | Bulging | 2 |
0.8%
|
| 3 | Sunken | 2 |
0.8%
|
| 4 | Not appropriate | 1 |
0.4%
|
| 8 | Unknown | 0 |
0%
|
| 9 | Missing | 0 | |
| Sysmiss | 1 |