| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| -7 | Does not apply | 32 | 
                                                                 
                                    
                                    5.5%
                                 
                                                             | 
                                                        
                    
| 0 | No obstacle | 422 | 
                                                                 
                                    
                                    72.8%
                                 
                                                             | 
                                                        
                    
| 1 | Minor obstacle | 43 | 
                                                                 
                                    
                                    7.4%
                                 
                                                             | 
                                                        
                    
| 2 | Moderate obstacle | 31 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    
| 3 | Major obstacle | 38 | 
                                                                 
                                    
                                    6.6%
                                 
                                                             | 
                                                        
                    
| 4 | Very severe obstacle | 14 | 
                                                                 
                                    
                                    2.4%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 1 |