Fig. 2

Plasma concentrations of ascorbate (a), retinol (b) and α-tocopherol (c) in healthy controls (n = 79) and patients with inflammatory bowel disease (IBD, n = 51), adenomatous polyps (n = 67) and colorectal cancer (n = 136). The results presented as medians, interquartile ranges and non-outlier ranges. Raw (retinol, α-tocopherol) or normalized (ascorbate) values were subjected to one-way analysis of variance (ANOVA) with LSD and Tukey post hoc tests