| Value | Category | Cases | |
|---|---|---|---|
| 1 | Scar present | 37 | 
                                
                                1.5%
                             | 
| 2 | Scar absent | 5 | 
                                
                                0.2%
                             | 
| 3 | No information | 1735 | 
                                
                                70.8%
                             | 
| 5 | miss | 0 | 
                                
                                0%
                             | 
| 9 | na | 674 | 
                                
                                27.5%
                             | 
| Sysmiss | 353 |