Table 3.

Values of relative risks for different genetic models

	Relative risks
Null model	γ1 = γ2 = γ = 1
Model with × inactivation
Recessive	γ1 = 1, γ2 = γ > 1
Additive	${\gamma }_1=\frac{\left(1+{\gamma }_2\right)}{2},\hspace{0.17em}{\gamma }_2=\gamma >1$
Dominant	γ1 = γ2 = γ > 1
Model without × inactivation
Recessive	γ1 = γ = 1, γ2 > 1
Additive	${\gamma }_1=\gamma =\frac{\left(1+{\gamma }_2\right)}{2},\hspace{0.17em}{\gamma }_2>1$
Dominant	γ1 = γ2 = γ > 1

γ₁ = Heterozygous relative risk for females; γ₂ = homozygous relative risk for females; γ = relative risk for males.