| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes (immunisation card) | 19940 |
34.6%
|
| 2 | yes (memory) | 27228 |
47.3%
|
| 3 | no | 10288 |
17.9%
|
| 4 | polio campaign | 117 |
0.2%
|
| Sysmiss | 3399 |