Table 5A.

Expected versus observed number of colorectal cancer–affected relatives

1 parent1 sibling2 siblings1 parent 1 siblingχ2
Observed4781751428
Expected
 Polygenic466.9189.89.621.75.3
 Mixed dominant462.4179.69.424.23.5
 Mixed recessive451.9200.110.822.47.0
 Mixed codominant462.4179.69.424.23.5
  • NOTE: The lower the χ2, the better the fit of the model. χ2 value for the difference between observed and expected number of affected relatives.