| Value | Category | Cases | |
|---|---|---|---|
| 44 | Vaccination given but no date recorded | 2 | 
                                
                                0.1%
                             | 
| 55 | invalid dates | 34 | 
                                
                                1.1%
                             | 
| 66 | Vaccination given but date not legible | 1 | 
                                
                                0%
                             | 
| 99 | Not Applicable | 2989 | 
                                
                                98.8%
                             | 
| Sysmiss | 926 |