| Value | Category | Cases | |
|---|---|---|---|
| 1 | Hole smaller than a thumb/figer 0.2-2 cm | 10 | 
                                                                 
                                    
                                    6.1%
                                 
                                                             | 
                                                        
                    
| 2 | Hole larger than thumb but smaller than fist/hand 2-10 cm | 13 | 
                                                                 
                                    
                                    8%
                                 
                                                             | 
                                                        
                    
| 3 | Hole larger than fist but smaller than head 10-25 cm | 6 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    
| 4 | Hole larger than head, more than 25 cm | 7 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    
| 5 | No holes | 127 | 
                                                                 
                                    
                                    77.9%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 6318 |