| Value | Category | Cases | |
|---|---|---|---|
| 1 | YES, PRESENT | 19469 | 
                                    
                                    97.4%
                                 | 
| 2 | NO, NOT PRESENT | 520 | 
                                    
                                    2.6%
                                 | 
| 9 | NO RESPONSE | 2 | 
                                    
                                    0%
                                 | 
| Sysmiss | 530 |