| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes (immunisation card) | 23469 |
45.6%
|
| 2 | yes (memory) | 26002 |
50.5%
|
| 3 | no | 1993 |
3.9%
|
| 4 | do not know | 36 |
0.1%
|
| Sysmiss | 11931 |