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. Author manuscript; available in PMC: 2017 Feb 1.
Published in final edited form as: Psychophysiology. 2008 Jul 4;45(5):825–838. doi: 10.1111/j.1469-8986.2008.00676.x

Table 7.

Summary of the Factor Analysis of the Neuropsychological Tests and of the Related Multiple Regression Analyses

Loadings > .50 Factor
Variable 1 2 3 4 5 6 7 8
mMMS 0.87
WAIS-R Vocab. 0.56
Forward Digit 0.80
Backward Digit 0.83
Boxes 0.82
Trail-A −0.63
Trail-B 0.63 0.55
Digit Copying 0.83
Digit Symbol 0.81
Letter Comp 3 0.67
Letter Comp 6 0.75
Letter Comp 9 0.73
OSPAN 0.68
Raven’s −0.87
Verbal Fluency (CFL) %
Alternate
WCST
  Categories completed 0.84
  Number of trials −0.63
  Correct 0.77
  Errors −0.91
  Perverative resp. −0.93
  Perseverative errors −0.94
  Nonperseverative errors −0.68 −0.51
  % perseverative errors −0.94
  Completion first category −0.53
  % conceptual level resp. 0.89
  Failure to maintain set 0.78
  Learning to learn 0.89
Beta weights
  Age −0.12 −0.19 0.10 0.10 −0.32 −0.04 −0.10 −0.24
  Gender −0.30 0.20 0.14 −0.02 −0.44 0.20 0.12 0.43
  VO2 −0.16 0.22 −0.03 −0.17 −0.32 0.19 0.58 0.02
  Education 0.48 −0.01 0.01 0.23 −0.03 −0.02 −0.22 −0.32
Multiple R 0.52 0.33 0.20 0.20 0.54 0.23 0.48 0.52

Notes. Beta weights in bold indicate p <.05, and in italics p <.10.