| Value | Category | Cases | |
|---|---|---|---|
| 44 | Vaccination given but no date recorded | 23 | 
                                
                                0.5%
                             | 
| 55 | invalid dates | 42 | 
                                
                                1%
                             | 
| 66 | Vaccination given but date not legible | 11 | 
                                
                                0.3%
                             | 
| 99 | Not Applicable | 4271 | 
                                
                                98.3%
                             | 
| Sysmiss | 1047 |