| Value | Category | Cases | |
|---|---|---|---|
| 44 | Vaccination given but no date recorded | 27 | 
                                
                                0.6%
                             | 
| 55 | invalid dates | 53 | 
                                
                                1.2%
                             | 
| 66 | Vaccination given but date not legible | 2 | 
                                
                                0%
                             | 
| 99 | Not Applicable | 4267 | 
                                
                                98.1%
                             | 
| Sysmiss | 1045 |