| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 3477 | 
                                                                 
                                    
                                    89.9%
                                 
                                                             | 
                                                        
                    
| 2 | Some difficulty | 291 | 
                                                                 
                                    
                                    7.5%
                                 
                                                             | 
                                                        
                    
| 3 | A lot of difficulty | 40 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    
| 4 | Cannot walk 500 m at all | 23 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    
| 9 | No response | 36 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 462 |