. Author manuscript; available in PMC: 2008 Jun 21.

Published in final edited form as: J Speech Lang Hear Res. 2008 Apr;51(2):423–435. doi: 10.1044/1092-4388(2008/031)

Table 4.

Standardized path estimate coefficients from the bivariate analyses.

	Genetic		Shared environment		Nonshared environment
Variable	A₁	A₂	C₁	C₂	E₁	E₂
Formal factor^a	.67^b		.74^b		.04
Conversational factor^c	.31^b	.78^b	.00	.00	.55	.00

Includes the Boston Naming Test (Goodglass & Kaplan, 2001) and the Vocabulary subtest from the Stanford–Binet Intelligence Test (Thorndike, Hagen, & Sattler, 1986).

Denotes correlations that are significant at an alpha of .05.

Includes mean length of C-unit, number of total words, number of different words, measure D, total number of conjunctions, and developmental sentence scores (Lee, 1974).