| Value | Category | Cases | |
|---|---|---|---|
| 0 | no prior child | 3148 |
8.8%
|
| 1 | 12545 |
35.2%
|
|
| 2 | 13804 |
38.8%
|
|
| 3 | 5376 |
15.1%
|
|
| 4 | 649 |
1.8%
|
|
| 5 | 88 |
0.2%
|