| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes (immunisation card) | 21367 |
37.1%
|
| 2 | yes (memory) | 27897 |
48.5%
|
| 3 | no | 8196 |
14.2%
|
| 4 | polio campaign | 113 |
0.2%
|
| Sysmiss | 3399 |