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Touch detection thresholds. A Wilcoxon Rank Sum test to compare measurements between 2 groups of patients. Bar graphs show the means ± standard error (black line) of the touch detection thresholds (bending force in grams) at the fingertip, palm, and forearm in the healthy volunteer group (n = 23 in blue) and the patient group (n = 25 in red). The skin test sites show a statistically significant difference between the groups that is more pronounced at the palm and forearm (P < 0.05).
