| Value | Category | Cases | |
|---|---|---|---|
| -9 | 1 | 
                                
                                0%
                             | |
| 44 | Vaccination given but no date recorded | 45 | 
                                
                                1.1%
                             | 
| 55 | invalid dates | 17 | 
                                
                                0.4%
                             | 
| 66 | Vaccination given but date not legible | 12 | 
                                
                                0.3%
                             | 
| 95 | 1 | 
                                
                                0%
                             | |
| 99 | Not Applicable | 4049 | 
                                
                                98.2%
                             | 
| Sysmiss | 215 |