| Value | Category | Cases | |
|---|---|---|---|
| 1 | Central | 162 |
19.2%
|
| 2 | Pleuritic | 476 |
56.5%
|
| 3 | Undefined | 205 |
24.3%
|
| 9 | Missing | 10 | |
| Sysmiss | 1831 |