| Value | Category | Cases | |
|---|---|---|---|
| 0 | not given | 507 |
24.7%
|
| 1995 | 47 |
2.3%
|
|
| 1996 | 100 |
4.9%
|
|
| 1997 | 160 |
7.8%
|
|
| 1998 | 255 |
12.4%
|
|
| 1999 | 591 |
28.8%
|
|
| 2000 | 292 |
14.2%
|
|
| 4444 | marked on card | 68 |
3.3%
|
| 6666 | mother reported | 34 |
1.7%
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| 9999 | missing | 0 |
0%
|
| Sysmiss | 13931 |