| Value | Category | Cases | |
|---|---|---|---|
| 0 | not given | 1746 |
85%
|
| 1996 | 2 |
0.1%
|
|
| 1997 | 2 |
0.1%
|
|
| 1998 | 11 |
0.5%
|
|
| 1999 | 16 |
0.8%
|
|
| 2000 | 20 |
1%
|
|
| 4444 | marked on card | 109 |
5.3%
|
| 6666 | mother reported | 148 |
7.2%
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| 9999 | missing | 0 |
0%
|
| Sysmiss | 13931 |