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. Author manuscript; available in PMC: 2011 Nov 16.
Published in final edited form as: Eur J Dev Sci. 2009;3(2):175–194.

Table 4.

Univariate estimates for heritability (h2), shared environment (c2) and nonshared environmental (e2) influences for examiner and child conversational language measures (with 95% confidence intervals).

Variable h2 c2 e2
Child
 Total Complete & Intelligible C-Units .56 (.22–.72) .00 (.00–.28) .44 (.35–.57)
 Mean Length of C-unit .52 (.18–.81) .12 (.00–.39) .37 (.28–.50)
 Number of Total Words .62 (.22–.82) .00 (.00–.29) .40 (.29–.57)
 Number of Different Words .48 (.00–.73) .05 (.00–.41) .48 (.36–.67)
 Total Number of Conjunctions .49 (.17–.70) .00 (.00–.21) .48 (.35–.67)
Examiner
 Total Complete & Intelligible C-Units .00 (.00–.08) .00 (.00–.06) 1.00 (.88–1.14)
 Mean Length of C-unit .09 (.00–.26) .00 (.00–.19) .89 (.72–1.09)
 Number of Total Words .10 (.00–.33) .00 (.00–.18) .88 (.67–1.12)
 Number of Different Words .20 (.00–.48) .00 (.00–.24) .79 (.55–1.01)
 Total Number of Conjunctions .01 (.00–.21) .00 (.00–.14) .94 (.73–1.11)