| Value | Category | Cases | |
|---|---|---|---|
| 1 | month and year | 64 | 
                                    
                                    78%
                                 | 
| 2 | month and age -y imp | 2 | 
                                    
                                    2.4%
                                 | 
| 3 | year and age - m imp out | 0 | 
                                    
                                    0%
                                 | 
| 5 | year - a, m imp | 14 | 
                                    
                                    17.1%
                                 | 
| 6 | age - y, m imp | 1 | 
                                    
                                    1.2%
                                 | 
| 7 | month - a, y imp | 0 | 
                                    
                                    0%
                                 | 
| 8 | none - all imp | 1 | 
                                    
                                    1.2%
                                 | 
| Sysmiss | 48 |