Variability of Reaction Time as a Marker of Executive Function Impairments in Fibromyalgia

Table 4

Statistics of the stepwise regression analyses conducted in the entire sample for predicting the hit and false alarm rates using traditional parameters ( and SD of RT) and ex-Gaussian parameters (mu, sigma, and tau of RT) after controlling for the effects of group.

Models for traditional parameters ( and SD of RT)
Dependent variable		Predictor
Hit rate	Step 1		-.52	.33	28.53	<.001
	Step 2		-.82	.37	5.14	.026
		SD	.38
False alarm rate	Step1	M	.48	.24	22.14	<.001
Models for ex-Gaussian parameters (mu, sigma, and tau of RT)
Dependent variable		Predictor
Hit rate	Step 1	mu	-.43	.26	19.30	<.001
	Step 2	mu	-.54	.35	10.03	.002
		tau	-.32
False alarm rate	Step1	tau	.30	.11	7.45	.008
	Step 2	tau	.44	.25	13.77	<.001
		mu	.40

Notes. : mean; SD: intraindividual standard deviation; RT: reaction time; : standardized coefficient for the predictor; : determination coefficient for the step; : statistic for the step; : value for the step.