| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 37 |
0.1%
|
| 2011 | 491 |
1.6%
|
|
| 2012 | 2187 |
7%
|
|
| 2013 | 3502 |
11.3%
|
|
| 2014 | 2316 |
7.5%
|
|
| 4444 | Marked on card | 97 |
0.3%
|
| 6666 | Mother reported | 12 |
0%
|
| 9997 | Inconsistent | 39 |
0.1%
|
| 9999 | Missing | 3 |
0%
|
| Sysmiss | 22399 |
72.1%
|