Results of independent pathway model with no common non-shared environmental influences. ANE = common genetic influences; CNE = common shared environmental influences; ENE = common non-shared environmental influences; ANE14, ANE20, and ANE24 = genetic influences specific to 14, 20, and 24 months; CNE14, CNE20, and CNE24 = shared environmental influences specific to 14, 20, and 24 months; ENE14, ENE20, and ENE24 = non-shared influences specific to 14, 20, and 24 months; NE14, NE20, and NE24 = latent negative emotionality at 14, 20, and 24 months; RES14, RES20, and RES24 = Restraint at 14, 20, and 24 months; TOY14, TOY20, and TOY24 = Toy Removal at 14, 20, and 24 months; BAY14, BAY20, and BAY24 = Bayley Scales at 14, 20, and 24 months; +p < 0.10; *p < 0.05; **p < 0.01. Parameters that had to be fixed to zero are shown in gray rather than black font.