| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes (immunisation card) | 19488 |
33.8%
|
| 2 | yes (memory) | 24659 |
42.8%
|
| 3 | no | 1961 |
3.4%
|
| 4 | polio campaign | 11465 |
19.9%
|
| Sysmiss | 3399 |