| Value | Category | Cases | |
|---|---|---|---|
| -9 | 1 | 
                                
                                0%
                             | |
| 44 | Vaccination given but no date recorded | 34 | 
                                
                                0.8%
                             | 
| 55 | invalid dates | 19 | 
                                
                                0.5%
                             | 
| 66 | Vaccination given but date not legible | 10 | 
                                
                                0.2%
                             | 
| 95 | 1 | 
                                
                                0%
                             | |
| 99 | Not Applicable | 4063 | 
                                
                                98.4%
                             | 
| Sysmiss | 212 |