| Value | Category | Cases | |
|---|---|---|---|
| 0 | not given | 25 | 
                                    
                                    5.2%
                                 | 
| 1995 | 58 | 
                                    
                                    12.1%
                                 | |
| 1996 | 129 | 
                                    
                                    26.9%
                                 | |
| 1997 | 96 | 
                                    
                                    20%
                                 | |
| 1998 | 69 | 
                                    
                                    14.4%
                                 | |
| 1999 | 26 | 
                                    
                                    5.4%
                                 | |
| 2000 | 22 | 
                                    
                                    4.6%
                                 | |
| 4444 | marked on card | 49 | 
                                    
                                    10.2%
                                 | 
| 6666 | mother reported | 5 | 
                                    
                                    1%
                                 | 
| 9997 | inconsistent | 0 | 
                                    
                                    0%
                                 | 
| 9998 | dk | 0 | 
                                    
                                    0%
                                 | 
| 9999 | missing | 0 | 
                                    
                                    0%
                                 | 
| Sysmiss | 14872 |