| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 266 |
92.7%
|
| 3 | 1 |
0.3%
|
|
| 5 | 1 |
0.3%
|
|
| 6 | 1 |
0.3%
|
|
| 9 | 1 |
0.3%
|
|
| 11 | 1 |
0.3%
|
|
| 15 | 1 |
0.3%
|
|
| 24 | 1 |
0.3%
|
|
| 27 | 1 |
0.3%
|
|
| 31 | 1 |
0.3%
|
|
| 44 | Marked on card - no date given | 9 |
3.1%
|
| 66 | Reported by mother | 2 |
0.7%
|
| 99 | Missing | 1 |
0.3%
|
| Sysmiss | 683 |