In the entire study population of 310 individuals, univariable linear regression analyses revealed that IBD diagnosis [β (95% CI) = 0.492 (0.305, 0.678), p < 0.0001] and VD deficiency [β (95% CI) = 0.236 (0.076, 0.397), p = 0.0040] were associated with elevated systemic CCL20 levels (Table 2). Here, CCL20 is linked to inflammatory bowel disease.