Table III.

Model fit comparisons in the best-fitting bivariate scalar sex limitation ACE model to determine if C or A can be dropped.

Model	Model Description	Estimated Parameters	−2LL	df	AIC	Δ(−2 LL)	Δdf	p	Comparison Model
5	AE, quant. sex-differences, commPath (a, c and e)	15	28989.08	10950	7089.08	2.15	5	0.828	3
6	CE, quant. sex-differences, commPath (a, c and e)	15	29004.57	10950	7104.57	17.64	5	0.00343	3
7	E, quant. sex-differences, commPath (a, c and e)	10	29163.42	10955	7253.42	176.49	10	1.25 × 10−32	3
8	AE, quant. sex-differences, commPath (a and e)	15	28989.08	10950	7089.08	3.7	10	0.96	1
9	AE, quant. sex-differences, commPath (e)	14	29026.47	10951	7124.47	37.4	1	9.66 × 10−10	8
10	AE, quant. sex-differences, commPath (a)	13	29043.07	10952	7139.07	54	2	1.89 × 10−12	8

Note: All five twin groups are included in the modeling (MZ female, MZ male, DZ female, DZ male, DZ opposite sex).

This table presents the model fit comparisons of the scalar sex limitation quantitative sex differences model (model 3 from the Table 2) and nested models (5-7). Models 8-10 represent fit comparisons of scalar sex limitation quantitative sex differences AE with common paths for correlated factors a and e (model 8) with model 5, model 1 (base model), and nested models AE with common paths for correlated factors e and a (model 9 and 10, respectively). CommPath: Common paths for correlated factors a, c and e; A=Additive genetic component, C=Common/Shared environmental component, E=Unique environmental component, qual.=qualitative, quant.=quantitative, a=Additive genetic, c=Common/Shared environmental, e=Unique environmental. Best fitting models are designated in bold text.