| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 426 |
6.1%
|
| 2014 | 161 |
2.3%
|
|
| 2015 | 388 |
5.5%
|
|
| 2016 | 584 |
8.3%
|
|
| 2017 | 7 |
0.1%
|
|
| 4444 | Marked on card | 29 |
0.4%
|
| 6666 | Mother reported | 37 |
0.5%
|
| 9997 | Inconsistent | 3 |
0%
|
| Sysmiss | 5370 |
76.7%
|