. Author manuscript; available in PMC: 2009 Sep 14.

Published in final edited form as: J Educ Psychol. 2007 Feb 1;99(1):128–139. doi: 10.1037/0022-0663.99.1.128

Table 4.

Phenotypic Correlations Among the Five Aspects of Mathematics

Measure	1	2	3	4	5
1. Applic	—	.68^*	.56^*	.65^*	.60^*
2. Underst		—	.57^*	.66^*	.61^*
3. Comput			—	.54^*	.45^*
4. Interp				—	.57^*
5. Non-Num					—

Note. Because the twins in a pair are not independent, the analysis was done on one twin in a pair. All children who were outliers or had missing data on any of the measures were excluded from the analysis. n = 811 individuals. Applic = Mathematical Application category; Underst = Understanding Number category; Comput = Computation and Knowledge category; Interp = Mathematical Interpretation category; Non-Num = Non-Numerical Processes category.

p <.01.