Table 2. Fit statistics from the models of variance components of education and body mass index allowing for gene-environment and correlation.

Model	−2*LL	df	χ2	Δdf	p	AIC	BIC
Body Mass Index - Females
All parameters free	41141.7	23982	—	—	—	41163.7	41224.2
Fix common A, C, and E moderation paths*	41147.5	23985	5.8	3	ns	41163.5	41207.5
Fix all moderation paths	41257.2	23988	109.7	3	<.001	41267.2	41294.7
Body Mass Index - Males
All parameters free	27853.3	17980	—	—	—	27875.3	27934.8
Fix common A, C, and E and unique A moderation paths*	27860.1	17984	6.8	4	ns	27874.1	27912.0
Fix all moderation paths	27936.1	17986	76.0	2	<.001	27946.1	27973.2

Note: A refers to genetic influences, C to shared environmental influences, and E to nonshared environmental influences.

There are possible common and unique moderation paths for each of A, C, and E. Best-fitting models are indicated by *. Fixed moderation paths were constrained to 0, which means that those sources of influence were present but did not vary across the levels of the moderators. AIC is Akaike Information Criterion. BIC is Bayesian Information Criterion. Because of the large sample size and number of statistical tests performed, we set the significance level for the chi-squared tests at .01.