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. Author manuscript; available in PMC: 2010 Aug 1.
Published in final edited form as: J Clin Exp Neuropsychol. 2008 Nov 26;31(6):706–719. doi: 10.1080/13803390802484797

Table 3. Hierarchial regression analysis.

B Std. Error β
Step 1a
Constant 24.66 4.61
Drug status -10.98 2.68 -.41**
Step 2b
Constant 56.81 8.97
Drug status -10.23 2.46 -.38**
Sex -22.11 5.44 -.38**
Step 3c
Constant 102.15 21.47
Drug status -8.97 2.46 -.34**
Sex -23.08 5.31 -.39**
Total correct WCST -.63 .27 -.21*
a

R2 = .17 for step 1

b

ΔR2 = .14 for step 2

c

ΔR2 = .04 (all ps < .05).

**

p < .001

*

p < .05