| Value | Category | Cases | |
|---|---|---|---|
| 0 | not given | 253 |
52.6%
|
| 1995 | 37 |
7.7%
|
|
| 1996 | 67 |
13.9%
|
|
| 1997 | 40 |
8.3%
|
|
| 1998 | 23 |
4.8%
|
|
| 1999 | 3 |
0.6%
|
|
| 2000 | 7 |
1.5%
|
|
| 4444 | marked on card | 43 |
8.9%
|
| 6666 | mother reported | 8 |
1.7%
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| 9999 | missing | 0 |
0%
|
| Sysmiss | 15504 |