| Value | Category | Cases | |
|---|---|---|---|
| 44 | Vaccination given but no date recorded | 10 | 
                                
                                0.2%
                             | 
| 55 | invalid dates | 27 | 
                                
                                0.6%
                             | 
| 66 | Vaccination given but date not legible | 3 | 
                                
                                0.1%
                             | 
| 99 | Not Applicable | 4297 | 
                                
                                99.1%
                             | 
| Sysmiss | 1057 |