| Value | Category | Cases | |
|---|---|---|---|
| 0 | not given | 408 |
84.8%
|
| 1996 | 1 |
0.2%
|
|
| 1997 | 1 |
0.2%
|
|
| 1998 | 1 |
0.2%
|
|
| 1999 | 2 |
0.4%
|
|
| 2000 | 1 |
0.2%
|
|
| 4444 | marked on card | 30 |
6.2%
|
| 6666 | mother reported | 37 |
7.7%
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| 9999 | missing | 0 |
0%
|
| Sysmiss | 15504 |