| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 1539 |
99.8%
|
| 11 | 1 |
0.1%
|
|
| 19 | 1 |
0.1%
|
|
| 24 | 1 |
0.1%
|
|
| 44 | Marked on card - no date given | 0 |
0%
|
| 66 | Reported by mother | 0 |
0%
|
| 99 | Missing | 0 |
0%
|
| Sysmiss | 380 |