| Value | Category | Cases | |
|---|---|---|---|
| 1 | One month or less | 1790 | 
                                                                 
                                    
                                    64.3%
                                 
                                                             | 
                                                        
                    
| 2 | Two months | 532 | 
                                                                 
                                    
                                    19.1%
                                 
                                                             | 
                                                        
                    
| 3 | Three months | 188 | 
                                                                 
                                    
                                    6.8%
                                 
                                                             | 
                                                        
                    
| 4 | Four months or more | 272 | 
                                                                 
                                    
                                    9.8%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 5927 |