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. Author manuscript; available in PMC: 2011 Jan 1.
Published in final edited form as: Intelligence. 2010 Jan 1;38(1):66–82. doi: 10.1016/j.intell.2009.07.003

Table 1.

Correlations, Reliability Estimates and Descriptive Statistics of the Task-Level DS and LNS scores and the Intelligence Test Scores

DS LNS Verbal Performance Achieve Full IQ
DS (0.77)
LNS 0.48 (0.71)
Verbal 0.45 0.48 (0.92)
Performance 0.35 0.45 0.57 (0.84)
Total Achieve 0.48 0.53 0.58 0.50 (0.91)
Full IQ 0.58 0.56 0.88 0.82 0.63 (0.95)
Mean 16.48 9.12 41.51 42.06 0.01 105.09
SD 3.75 2.61 11.13 8.42 1.88 16.48

Note: Acronyms for the variables are, DS for Digit Span total, LNS for Letter-Number Sequencing total, Verbal for the sum of four WISC-R Verbal subscales, Performance for the sum of four WISC-R Performance subscales, and Achievement for the total standard scores of Chinese and Mathematics achievement tests. Except for the WISC-R Full IQ (Full IQ), the reliability estimates displayed in the diagonals are item-based Cronbach Alpha coefficients. The reliability coefficient for the WISC-R Full IQ is the estimate reported for the normative sample.