Table 5.

Estimated means and variances of the latent phenotypic factor, θ, in the different age groups

Age	MEAN(θ)		VAR(θ)
	Estimate	se	Estimate	se
DZ
18–19	0a	–	1a	–
20–21	−0.06	0.04	0.92	0.03
22–24	0.14	0.06	0.95	0.04
25–34	0.13	0.06	1.05	0.04
35–70	0.02	0.05	1.01	0.03
MZ
18–19	0a	–	1a	–
20–21	0.045	0.053	1.013	0.037
22–24	0.095	0.074	1.118	0.054
25–34	0.217	0.066	1.076	0.046
35–70	−0.116	0.050	1.017	0.037

^aThese parameters are constrained for identification purposes