| Value | Category | Cases | |
|---|---|---|---|
| 1 | Hole smaller than a thumb/figer 0.2-2 cm | 37 | 
                                                                 
                                    
                                    7.1%
                                 
                                                             | 
                                                        
                    
| 2 | Hole larger than thumb but smaller than fist/hand 2-10 cm | 41 | 
                                                                 
                                    
                                    7.9%
                                 
                                                             | 
                                                        
                    
| 3 | Hole larger than fist but smaller than head 10-25 cm | 30 | 
                                                                 
                                    
                                    5.8%
                                 
                                                             | 
                                                        
                    
| 4 | Hole larger than head, more than 25 cm | 21 | 
                                                                 
                                    
                                    4%
                                 
                                                             | 
                                                        
                    
| 5 | No holes | 390 | 
                                                                 
                                    
                                    75.1%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 5962 |