Table 3.

Correlation between Closure Flexibility Task (CFT) performance and Continuous Performance Task-Identical Pairs (CPT-IP) prior to and following control for specific cognitive task performance in patients.

First Step	Second Step	R change	F change	Sig (p)
None	CFT	.67	9.5	.009
PSI	CFT	.56	6.3	.029
POI	CFT	.74	16.0	.002
WMI	CFT	.74	13.8	.003
BVMT-R	CFT	.65	8.8	.013
LM	CFT	.68	8.5	.015
None	PSI	.35	1.7	.216
CFT	PSI	.00	0.01	.926

Analyses were performed using step-wise regression, with indicated variables forced into the regression in the first and second steps and Identical Pairs Continuous Performance Task (CPT-IP) as the dependent variable. CFT vs. CPT-IP correlations remained significant even following correction for non-specific inter-correlation among neuropsychological measures using processing speed index (PSI), perceptual organization index (POI), working memory index (WMI), Brief Visuospatial Memory Test-Revised (BVMT-R), and the Logical Memory Test (LM). Note that R change is the square root of R² change. In the instance when CFT is entered alone vs CPT-IP, with no previous variable entered, R change is the correlation between CFT and CPT-IP.