Figure 4. (A) Scatter plot to show the correlation between transient receptor potential vanilloid type-1 (TRPV1) levels and average pain scores (VASav) in irritable bowel syndrome (IBS) subjects. Pearson correlation r = 0.68, p<0.001. Spearman correlation r = 0.45, p = 0.02. (B) Scatter plot to show the correlation between TRPV1 levels and average pain scores (VASav) in control subjects. Pearson correlation r = −0.1, p = 0.34. (C) Scatter plot to show the correlation between TRPV1 levels and VASav in all subjects (controls and IBS). Pearson correlation r = 0.6, p<0.001. Spearman correlation r = 0.46; p<0.001.
