| Value | Category | Cases | |
|---|---|---|---|
| 0 | not given | 42 | 
                                    
                                    8.8%
                                 | 
| 1995 | 52 | 
                                    
                                    10.9%
                                 | |
| 1996 | 119 | 
                                    
                                    24.8%
                                 | |
| 1997 | 105 | 
                                    
                                    21.9%
                                 | |
| 1998 | 68 | 
                                    
                                    14.2%
                                 | |
| 1999 | 32 | 
                                    
                                    6.7%
                                 | |
| 2000 | 17 | 
                                    
                                    3.5%
                                 | |
| 4444 | marked on card | 41 | 
                                    
                                    8.6%
                                 | 
| 6666 | mother reported | 3 | 
                                    
                                    0.6%
                                 | 
| 9997 | inconsistent | 0 | 
                                    
                                    0%
                                 | 
| 9998 | dk | 0 | 
                                    
                                    0%
                                 | 
| 9999 | missing | 0 | 
                                    
                                    0%
                                 | 
| Sysmiss | 14872 |