| Value | Category | Cases | |
|---|---|---|---|
| 1 | day | 127 | 
                                                         
                                
                                1.3%
                                                             
                                                     | 
                                            
| 2 | week | 94 | 
                                                         
                                
                                1%
                                                             
                                                     | 
                                            
| 3 | month | 6233 | 
                                                         
                                
                                65.7%
                                                             
                                                     | 
                                            
| 4 | not periodic | 3035 | 
                                                         
                                
                                32%
                                                             
                                                     | 
                                            
| Sysmiss | 14 |