Table 2.

Heritability estimates for selected discrete phenotypes

		Model test	p-Value
DESIRE		POL vs. sporadic	3.49 × 10-6c
		MIT vs. POL	0.067
		XFX vs. POL	0.050
final model:a	h2g: 0.48(0.12) + e2: 0.52(0.12)
CRAVING		POL vs. sporadic	0.0003c
		MIT vs. POL	0.005c
		XFX vs. MIT	0.229
final model:a	h2g: 0.00(0.14b) + e2: 0.81(0.05) + h2mt: 0.19(0.05)
SPENT		POL vs. sporadic	0.020d
		MIT vs. POL	0.356
		XFX vs. POL	0.034d
final model:a	h2g: 0.00(0.05b) + e2: 0.94(0.02) + h2Xf: 0.06(0.02)

^aEstimates (SE) of parameters retained in the final model (the final estimate of h²_g is given even when = 0). h²_g, autosomal additive genetic heritability; h²_mt, heritability due to the mitochondrion; h²_Xf, X-linked heritability in females; e², environmental component.

^bOne-tailed empirical SEs estimated for point estimates at the boundary.

^cp < 0.01

^dp < 0.05