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Mean PhNRpulse amplitudes of the control subjects (open symbols) and OA patients (filled symbols) in response to G (circles), Y (squares), and R (diamonds) pulses. The horizontal dashed line demarcates zero amplitude. Error bars represent ±1 standard error of the mean (sem). Brackets and asterisks indicate statistically significant comparisons, where * indicates p < 0.05, ** indicates p < 0.01, and *** indicates p < 0.001.
