| Value | Category | Cases | |
|---|---|---|---|
| 0 | No prior child | 2966 | 
                                                         
                                
                                48.5%
                                                             
                                                     | 
                                            
| 1 | 2471 | 
                                                         
                                
                                40.4%
                                                             
                                                     | 
                                            |
| 2 | 596 | 
                                                         
                                
                                9.7%
                                                             
                                                     | 
                                            |
| 3 | 74 | 
                                                         
                                
                                1.2%
                                                             
                                                     | 
                                            |
| 4 | 9 | 
                                                         
                                
                                0.1%
                                                             
                                                     |