| Value | Category | 
                                    
                    
                        | 0 | No obstacle | 
                                    
                    
                        | 1 | Minor obstacle | 
                                    
                    
                        | 2 | Moderate obstacle | 
                                    
                    
                        | 3 | Major obstacle | 
                                    
                    
                        | 4 | Very Severe Obstacle | 
                                    
                    
                        | 5 | Not applicable | 
                                    
                    
                        | 9 | DK-NA | 
                                    
                    
                        | Sysmiss |  | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.