Table 4. Regression analysis for the prediction of cognitive test scores from clinical variables and body mass index in FMS patients (only significant results of the second block are presented).

Test	Model	Predictor	Β	r2	t	p
N-back task (2-back)	Model 1	McGill Pain Questionnaire: Affective Pain	-.33	0.11	-2.56	.014
Five Digits Test: Inhibition	Model 1	Body Mass Index	.36	0.10	2.39	.021
Five Digits Test: Shifting	Model 1	Body Mass Index	.47	0.18	3.54	.001
Stroop Test: Inhibition	Model 1 Model 2	Body Mass Index	.38	0.12	2.72	.009
		Body Mass Index	.39	0.07	2.92	.005
		State-Trait Anxiety Inventory: Trait	.28		2.15	.037
Wisconsin Card Sorting Test	Model 1	McGill Pain Questionnaire: Sensorial Pain	.29	0.08	2.32	.024
Iowa Gambling Task	Model 1	Fatigue Severity Scale	-.37	.14	-2.77	.008

Note: Standardized β and adjusted r² change are indicated.