| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes (immunisation card) | 20869 |
36.2%
|
| 2 | yes (memory) | 27723 |
48.2%
|
| 3 | no | 8867 |
15.4%
|
| 4 | polio campaign | 114 |
0.2%
|
| Sysmiss | 3399 |