| Value | Category | Cases | |
|---|---|---|---|
| 1 | MONTHS | 41 | 
                                    
                                    1.2%
                                 | 
| 2 | YEARS | 692 | 
                                    
                                    20.4%
                                 | 
| 9 | SPECIAL | 560 | 
                                    
                                    16.5%
                                 | 
| Sysmiss | 2098 | 
                                    
                                    61.9%
                                 |