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. Author manuscript; available in PMC: 2012 Dec 1.
Published in final edited form as: Learn Individ Differ. 2011 Dec 1;21(6):710–718. doi: 10.1016/j.lindif.2011.09.001

Table 2.

Phenotypic correlations between self-evaluation and mathematics achievement at 9 and 12 years

Math at 9 SEV at 9 SEV at 12 Math at 12
Math at 9 – .34
n = 1452		 .38
n = 1393		 .57
n = 693
SEV at 9 .26
n = 1410		 – .50
n = 1818		 .26
n = 862
SEV at 12 .20
n = 932		 .47
n = 1244		 – .35
n = 829
Math at 12 .32
n = 433		 .18
n = 571		 .29
n = 575		 –

Note. Correlations for one randomly selected member of each twin pair (indicated by n). All the correlations are significant at p < .01. Correlations before the adjustment of IQ are above the diagonal and correlations after the adjustment of IQ are below the diagonal. SEV = self-evaluation, reported by children; Math = mathematics achievement, assessed by teachers according to the National Curriculum.