Evaluation of Factors Affecting Continuous Performance Test Identical Pairs Version Score of Schizophrenic Patients in a Japanese Clinical Sample

Table 3

Multiple regression analysis of mean d′ score.

Multiple regression analysis
Forward-backward stepwise selection
Clinical factors	Patients (𝑛=126)
	Setting: 𝑃in=0.05,𝑃out=0.1
	PRC^a	S-PRC^b	VIF^c	95% CI^d		𝑃 value
				Lower	Upper
Age (y)	−0.031	−0.45	1.04	−0.041	−0.020	<0.001
CPZ-equivalent dose (mg/day)	−0.00038	−0.21	1.01	−0.001	<0	0.012
PANSS-negative symptom score (7–49)	−0.026	−0.16	1.04	−0.052	<0	0.017
Intercept	3.54	—	—	2.89	4.19	<0.001
𝑅^2e	0.28
ANOVA 𝑃 value	<0.001
Durbin-Watson ratio	1.93

^apartial regression coefficient
^bstandardized partial regression coefficient
^cvariance inflation factor
^dconfidence interval
^emultiple correlation coefficient adjusted for the degrees of freedom.