| Value | Category | Cases | |
|---|---|---|---|
| 1 | Clinic card/vaccination booklet | 351 |
6.1%
|
| 2 | Respondent recall | 209 |
3.6%
|
| 4 | Date of birth unknown | 1 |
0%
|
| Sysmiss | 5185 |
90.2%
|