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Boxplots showing 25-OH-D3 levels in spring (Apr–Jun), summer (Jul–Sept), and autumn/winter (Oct–Jan) in the patients with CD and UC. In the patients with CD, 25-OH-D3 levels were significantly enhanced in summer compared to spring, as revealed by linear regression adjusted for age, gender, and BMI. CD, Crohn's disease; UC, ulcerative colitis; 25-OH-D3, 25-hydroxyvitamin D3.
