Fig. 3

Serum LCN2 levels in human patients. a Detection of serum LCN2 levels in patients with AS-IBD (coexisting AS and IBD; n = 57), AS (ankylosing spondylitis; n = 462), IBD (inflammatory bowel disease; n = 85), HC (healthy control; n = 158), and MBP (mechanical back pain; n = 52). b Detection of serum LCN2 levels of different degrees of ankylosis (mSASSS > 10 vs. MSASSS ≤ 10), in AS patients with or without IBD. One-way analysis of variance (ANOVA) followed by Bonferroni’s multiple comparison test was used