Table 4.

Multiple regression analysis of the independent variables (same variables as Table 3) related to the cross-sectional area (dependent variable) of the sural nerve, excluding obese patients.

Independent variables	Coefficient	Standard error	t	p	rpartial	rsemipartial
Constant	0.7051
BMI	0.07385	0.03577	2.064	0.0432	0.2536	0.2326
Disease duration	0.001606	0.02159	0.0744	0.9409	0.009448	0.008380
Treatment	0.007896	0.02332	0.680	0.8189	0.009992	0.001452
Age	−0.004673	0.01028	−0.455	0.6510	−0.05763	0.05120
FIQR	−0.01614	0.007088	−2.277	0.0263	−0.2778	0.2565
PDQ	0.06209	0.02065	3.006	0.0038	0.3567	0.3386

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