| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 52 | 
                                                                 
                                    
                                    94.5%
                                 
                                                             | 
                                                        
                    
| 2 | Some difficulty | 3 | 
                                                                 
                                    
                                    5.5%
                                 
                                                             | 
                                                        
                    
| 3 | A lot of difficulty | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 4 | Cannot walk 500 m at all | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9 | No response | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 4274 |