Table 1.

Pairwise correlations between adjusted ESC and measured variables.

Variable 1	P	p-value
SGNFD	ρ = 0.64, n = 66	=0.0001
ENFD	ρ = 0.73, n = 81	=0.0001
Hemoglobin A1c	ρ = −0.4, n = 39	=0.01
NPSI	−0.05	=0.67
Pain scale (0–10)	−0.02	=0.88
NTSS-6	−0.05	=0.67
SAS	0.17	=0.13

ESC, electrochemical skin conductance at the feet adjusted for weight. Pearson correlation (r) and Spearman's rank correlation (ρ) coefficients have been used for data with normal and non-normal distributions, respectively. SGNFD, sweat gland nerve fiber density; ENFD, epidermal nerve fiber density; NPSI, the Neuropathic Pain Symptom Inventory; NTSS-6, the Neuropathy Total Symptom Score-6; SAS, the Survey of Autonomic Symptoms.