| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 708 |
95.2%
|
| 44 | Marked on card - no date given | 7 |
0.9%
|
| 66 | Reported by mother | 23 |
3.1%
|
| 99 | Missing | 6 |
0.8%
|