| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. yes | 1536 | 
                                    
                                    99.5%
                                 | 
| 2 | 2. no | 8 | 
                                    
                                    0.5%
                                 | 
| 3 | 3. absent | 0 | 
                                    
                                    0%
                                 | 
| Sysmiss | 1448 |