. Author manuscript; available in PMC: 2012 Jul 1.

Published in final edited form as: J Learn Disabil. 2011 May 12;44(4):322–329. doi: 10.1177/0022219411407862

Table 3. Intercorrelations (Below Diagonal) and Correlation Ns (Above Diagonal) of the four Composite Measures, and Correlations between Twin 1 and 2 for Monozygotic (MZ) and Dizygotic (DZ) Pairs.

	Static PA	Dynamic PA	LK	TOWRE	MZ	DZ
Static PA^a		1,988	1,867	1,871	.81	.70
Dynamic PA^b	.550		1,868	1,873	.71	.47
LK^c	.546	.650		1,752	.62	.44
TOWRE^d	.538	.423	.523		.89	.57

Note. TOWRE = Test of Word Recognition Efficiency. PA = phonemic awareness. LK = letter knowledge.