| Value | Category | Cases | |
|---|---|---|---|
| -998 | Dont know | 0 | 
                                    
                                    0%
                                 | 
| -888 | Other(specify) | 0 | 
                                    
                                    0%
                                 | 
| 1 | At birth | 0 | 
                                    
                                    0%
                                 | 
| 2 | At 1.5 months | 0 | 
                                    
                                    0%
                                 | 
| 3 | At 2.5 months | 0 | 
                                    
                                    0%
                                 | 
| 4 | At 3.5 months | 89 | 
                                    
                                    80.9%
                                 | 
| 5 | At 9 months | 14 | 
                                    
                                    12.7%
                                 | 
| 6 | Between 16 to 24 months | 3 | 
                                    
                                    2.7%
                                 | 
| 7 | Between 24 to 36 months | 4 | 
                                    
                                    3.6%
                                 | 
| Sysmiss | 21 |