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. Author manuscript; available in PMC: 2011 Jul 5.
Published in final edited form as: Cognition. 2010 Mar 27;115(3):394–406. doi: 10.1016/j.cognition.2010.02.002

Table 2.

Hierarchical regression models for children’s performance in Experiment 2.

Model DV Predictor R2 change Significance of R2 change
1 School Mathematics Test Age .015 p = .344
Verbal IQ 0.227 p < .001
Literacy 0.323 p < .001
Non-symbolic addition 0.033 p = .036
Symbolic number knowledge 0.084 p < .001
2 Symbolic number knowledge Age .017 p = .322
Verbal IQ .237 p < .001
Literacy .326 p < .001
Non-symbolic addition .041 p = .017
3 School Mathematics Test Age .015 p = .344
Verbal IQ .227 p < .001
Literacy .323 p < .001
Symbolic number knowledge .111 p < .001
Non-symbolic addition .007 p = .286