| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes (immunisation card) | 20241 |
39.3%
|
| 2 | yes (memory) | 19565 |
38%
|
| 3 | no | 10709 |
20.8%
|
| 4 | do not know | 985 |
1.9%
|
| Sysmiss | 11931 |