| Value | Category | Cases | |
|---|---|---|---|
| 1 | Days | 8 | 
                                    
                                    4.8%
                                 | 
| 2 | Weeks | 6 | 
                                    
                                    3.6%
                                 | 
| 3 | Months | 116 | 
                                    
                                    69%
                                 | 
| 4 | Years | 38 | 
                                    
                                    22.6%
                                 | 
| Sysmiss | 767 |