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Table 1 Number and size of families.

From: Transmission ratio distortion in families from the Framingham Heart Study

Families 2 Sibs 3 Sibs 4 Sibs 5 or More Sibs Total Number of Families
Female 166 43 11 2 222
Male 141 47 9 4 201
Not divided by sex 194 163 67 35 459