| Value | Category | Cases | |
|---|---|---|---|
| 1 | month and year | 14375 | 
                                    
                                    96.2%
                                 | 
| 2 | month and age -y imp | 6 | 
                                    
                                    0%
                                 | 
| 3 | year and age - m imp | 303 | 
                                    
                                    2%
                                 | 
| 4 | y & age - y ignored | 0 | 
                                    
                                    0%
                                 | 
| 5 | year - a, m imp | 95 | 
                                    
                                    0.6%
                                 | 
| 6 | age - y, m imp | 38 | 
                                    
                                    0.3%
                                 | 
| 7 | month - a, y imp | 8 | 
                                    
                                    0.1%
                                 | 
| 8 | none - all imp | 121 | 
                                    
                                    0.8%
                                 |