Table 3.

Multiple regression analysis of the independent variables related to the cross-sectional area (dependent variable) of the sural nerve.

Independent variables	Coefficient	Standard error	t	p	rpartial	rsemipartial
Constant	−0.5261
BMI	0.08358	0.01987	4.207	0.0001	0.3862	0.3573
Disease duration	−0.01769	0.02436	−0.726	0.4695	−0.07206	0.06167
Treatment	0.007743	0.021321	0.675	0.8087	0.009872	0.001231
Age	0.0006697	0.01070	0.0626	0.9502	0.006227	0.005316
FIQR	−0.002547	0.007306	−0.349	0.7280	−0.03467	0.02962
PDQ	0.06569	0.02140	3.069	0.0028	0.2921	0.2607

BMI, Body Mass Index; FIQR, revised Fibromyalgia Impact Questionnaire; PDQ, PainDetect Questionnaire.