| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes (immunisation card) | 19361 |
37.6%
|
| 2 | yes (memory) | 19088 |
37.1%
|
| 3 | no | 12058 |
23.4%
|
| 4 | do not know | 993 |
1.9%
|
| Sysmiss | 11931 |