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. Author manuscript; available in PMC: 2015 Feb 19.
Published in final edited form as: Intelligence. 2014 Feb 19;43:65–76. doi: 10.1016/j.intell.2014.01.008

Table 1.

Standardized variance components for individual cognitive tests

A (95% CI) C (95% CI) E (95% CI)
WASI Vocabulary .46 (.29; .62) .19 (.04; .34) .35 (.30; .41)
AFQT Vocabulary .39 (.24; .51) .11 (.01; .24) .50 (.44; .58)
WMS-3 Digit Span Forwards .44 (.26; .57) .12 (.01; .27) .44 (.38; .52)
WMS-3 Digit Span Backwards .33 (.16; .48) .13 (.00; .29) .54 (.48; .62)
WMS-3 Letter Number Sequencing .36 (.17; .54) .17 (.02; .35) .47 (.40; .53)
AFQT Box Folding .54 (.37; .63) .04 (.00; .19) .42 (.37; .49)
Hidden Figures .65 (.53; .74) .07 (.00; .18) .28 (.24; .33)
WASI Matrix Reasoning .36 (.18; .54) .18 (.03; .34) .46 (.39; .53)
DKEFS Trail Making Condition 2 .30 (.16; .41) .07 (.00; .20) .63 (.55; .70)
DKEFS Trail Making Condition 3 .32 (.14; .48) .11 (.00; .27) .57 (.49; .65)

A = Additive Genetic Influences. C = Common/Shared Environmental Influences. E = Unique Environmental Influences. Estimates were derived from the full ACE Cholesky decomposition.