| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 2653772 | 
                                    
                                    98.2%
                                 | 
| 2 | Yes, some difficulty | 38720 | 
                                    
                                    1.4%
                                 | 
| 3 | Yes, a lot of difficulty | 6559 | 
                                    
                                    0.2%
                                 | 
| 4 | Cannot hear at all | 1994 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 383938 |