| Value | Category | Cases | |
|---|---|---|---|
| -998 | Dont know | 0 | 
                                    
                                    0%
                                 | 
| -888 | Other(specify) | 0 | 
                                    
                                    0%
                                 | 
| 1 | At birth | 0 | 
                                    
                                    0%
                                 | 
| 2 | At 1.5 months | 103 | 
                                    
                                    87.3%
                                 | 
| 3 | At 2.5 months | 9 | 
                                    
                                    7.6%
                                 | 
| 4 | At 3.5 months | 1 | 
                                    
                                    0.8%
                                 | 
| 5 | At 9 months | 5 | 
                                    
                                    4.2%
                                 | 
| 6 | Between 16 to 24 months | 0 | 
                                    
                                    0%
                                 | 
| 7 | Between 24 to 36 months | 0 | 
                                    
                                    0%
                                 | 
| Sysmiss | 13 |