Size Affected Proband Families
10 3 1 1
9 3 1 1
8 4 1 1
7 3 2 1
7 3 1 1
7 2 1 1
7 1 1 1
6 2 1 1
6 1 1 1
5 3 3 1
5 3 2 1
5 2 1 5
5 1 1 2
4 3 2 1
4 3 1 2
4 2 1 4
4 1 1 6
3 2 2 3
3 2 1 3
3 1 1 10
2 2 2 2
2 2 1 4
2 1 1 18
1 1 1 9
Sibship sizes are different, ranging 1-10.
Table 1: Number of families affected by sibship size, number affected offspring and number of probands (Crow 1965).