| Value | Category | Cases | |
|---|---|---|---|
| 2 | SOME DIFFICULTY | 2 | 
                                    
                                    0.1%
                                 | 
| 3 | A LOT OF DIFFICULTY | 3 | 
                                    
                                    0.2%
                                 | 
| 4 | CANNOT WALK AT ALL | 1 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 1558 | 
                                    
                                    99.6%
                                 |