Table 1

MZ and DZ twin relative risks as a function of prevalence (K) and heritability (H) according to a multifactorial threshold model

KH = 20%H = 30%H = 40%
λMλDRMDλMλDRMDλMλDRMD
3%2.41.62.43.52.02.54.92.42.7
1%3.41.92.65.52.62.98.63.43.2
0.1%6.82.83.315.04.63.929.66.84.9