| Value | Category | Cases | |
|---|---|---|---|
| 1 | Easily | 374 | 
                                    
                                    10.9%
                                 | 
| 2 | With some difficulty | 1882 | 
                                    
                                    55%
                                 | 
| 3 | With much difficulty | 736 | 
                                    
                                    21.5%
                                 | 
| 4 | Unable to do | 432 | 
                                    
                                    12.6%
                                 | 
| Sysmiss | 40881 |