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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 3.

Intraclass Correlations for Child and Examiner Measures across Monozygotic (MZ) and Dizygotic (DZ) Twins.

Language Variable MZr DZr
Child
 Total Complete and Intelligible C-Units .57** .26**
 Mean Length of C-Unit .54** .41**
 Number of Total Words .50** .30**
 Number of Different Words .48** .29**
 Total Number of Conjunctions .46** .20**
Examiner
 Total Complete and Intelligible C-units −.10 −.11
 Mean Length of C-Unit .08 .04
 Number of Total Words .15 −.03
 Number of Different Words .10 .07
 Total Number of Conjunctions .03 −.07

Note. All measures have been corrected for child age and sex.

*

Denotes significance at .05.

**

Denotes significance at .01.