. Author manuscript; available in PMC: 2010 Sep 26.

Published in final edited form as: Behav Genet. 2008 Dec 16;39(2):133–144. doi: 10.1007/s10519-008-9242-z

Table 3.

Results from the full Cholesky model

	Test 1: Speed	Test 2: Speed	Test 2: Planning time	Test 1: Efficiency	Test 2: Efficiency	Test 2: Number of attempts
Genetic effects
Test 1: Speed	0.28^*
Test 2: Speed	0.96^*	0.31^*
Test 2: Planning time	0.59	0.62	0.21
Test 1: Efficiency	0.41	0.40	0.27	0.22^*
Test 2: Efficiency	0.52	0.49	0.32	0.99^*	0.17^*
Test 2: Number of attempts	0.81^*	0.87^*	0.52	0.79^*	0.84^*	0.28
Shared environmental effects
Test 1: Speed	0.15
Test 2: Speed	0.92	0.18
Test 2: Planning time	0.71	0.57	0.10
Test 1: Efficiency	0.33	0.46	0.67	0.15
Test 2: Efficiency	0.43	0.40	0.87	0.71	0.05
Test 2: Number of attempts	0.15	0.29	0.54	0.67	0.86	0.17
Nonshared environmental effects
Test 1: Speed	0.58^*
Test 2: Speed	0.34^*	0.51^*
Test 2: Planning time	0.27^*	0.26^*	0.69^*
Test 1: Efficiency	0.21^*	−0.03	0.07	0.63^*
Test 2: Efficiency	−0.14^*	0.41^*	−0.03	0.18^*	0.78^*
Test 2: Number of attempts	−0.11	−0.08	0.21^*	0.11	0.15^*	0.55^*

Speed, execution time; efficiency, % moves above minimum (higher scores indicate poorer efficiency); number of attempts, number of attempts to mentally figure puzzle

Variance components shown on the diagonals. Correlations shown on the off-diagonals

P < 0.05