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Family structures from the Boston Early-Onset Study.
| Offspring | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | Total |
|---|---|---|---|---|---|---|---|---|---|---|
| Parents Present | 21 | 23 | 5 | 3 | 2 | 1 | 1 | 0 | 0 | 56 |
| Missing 1 Parent | — | 43 | 30 | 7 | 2 | 2 | 0 | 0 | 1 | 85 |
| Missing 2 Parents | — | 35 | 21 | 13 | 8 | 3 | 0 | 3 | 1 | 84 |
| Total | 21 | 101 | 56 | 23 | 12 | 6 | 1 | 3 | 2 | 225 |
