| Value | Category | Cases | |
|---|---|---|---|
| 0 | no prior child | 3645 |
9%
|
| 1 | 12502 |
31%
|
|
| 2 | 12831 |
31.8%
|
|
| 3 | 9190 |
22.8%
|
|
| 4 | 1999 |
4.9%
|
|
| 5 | 202 |
0.5%
|
|
| 6 | 25 |
0.1%
|