| Value | Category | Cases | |
|---|---|---|---|
| 44 | Vaccination given but no date recorded | 18 | 
                                
                                0.6%
                             | 
| 55 | invalid dates | 12 | 
                                
                                0.4%
                             | 
| 66 | Vaccination given but date not legible | 5 | 
                                
                                0.2%
                             | 
| 99 | Not Applicable | 2991 | 
                                
                                98.8%
                             | 
| Sysmiss | 926 |