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. Author manuscript; available in PMC: 2010 Jun 3.
Published in final edited form as: Read Writ. 2009 Jan 1;22(1):107–116. doi: 10.1007/s11145-007-9111-9

Table 1.

Means and standard deviations with matrix of Pearson correlations: sub-sample 1 in rows and below diagonal, sub-sample 2 in columns and above diagonal, twin intra-class correlations on diagonal

Sub-sample 2
Word Attack Word Ident. Eff. Control Surgency
Sub-sample 1 M (SD) 110.7 (11.2) 112.2 (12.7) 5.34 (.68) 4.43 (.90)
Word Attack 110.1 (12.1) graphic file with name nihms-178591-t0002.jpg
Word Identification 112.1 (12.8)
Effortful Control 5.38 (.58)
Surgency 4.45 (.74)

Note: All correlations significant at p < .05 (two-tailed) unless ns (non-significant). Descriptive statistics for Effortful Control and Surgency based on mothers’ reports, which were not significantly different from fathers’ reports. Mothers’ and fathers’ reports were averaged prior to estimation of correlations and for subsequent regression analyses