| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 1178 |
95.9%
|
| 44 | Marked on card - no date given | 13 |
1.1%
|
| 66 | Reported by mother | 28 |
2.3%
|
| 99 | Missing | 9 |
0.7%
|