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. Author manuscript; available in PMC: 2010 May 1.
Published in final edited form as: J Neurolinguistics. 2009 May;22(3):219–236. doi: 10.1016/j.jneuroling.2008.09.003

Table 3.

Intraclass Twin Correlations

Measure US
 Australia
 Scandinavia
MZ DZ MZ DZ MZ DZ
TOWRE SWE .83 .45 .79 .32 .87 .51
TOWRE PDE .80 .46 .79 .33 .82 .61
Woodcock Passage Comprehension .72 .45 .71 .33 .76 .46
WRAT Spelling .79 .41 .74 .10 .68 .24
Boston Naming Test .85 .63 .69 .54 .84 .47

Note: TOWRE = Test of Word Reading Efficiency; SWE= Sight Word Efficiency; PDE = Phonemic Decoding Efficiency; WRAT= Wide Range Achievement Test; MZ = monozygotic twins, DZ = dizygotic twins.