| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 1445 |
60.2%
|
| 44 | Marked on card - no date given | 39 |
1.6%
|
| 66 | Reported by mother | 902 |
37.6%
|
| 99 | Missing | 15 |
0.6%
|