Incidence and risk factors for anemia among newly-diagnosed intestinal Behcet's disease patients.

Background: To investigate the incidence, characteristics, and potential risk factors of anemia in patients with newly-diagnosed intestinal Behcet's disease (BD).

Methods: In this cross-sectional study, 106 newly-diagnosed intestinal BD patients were identified, and a gender-, age- and organ involvement-matched control group of 241 non-intestinal BD patients was established. Hemoglobin (Hb) levels below 120 g/L in women and 130 g/L in men were diagnosed as anemia; these were further classified as mild (Hb ≥ 90 g/L), moderate (60  g/L ≤ Hb < 90  g/L), and severe (Hb < 60 g/L) anemia for both genders. The prevalence, type and severity of anemia in these patients were assessed. Logistic regression was performed to analyze the relationship between clinical variables and anemia in newly-diagnosed intestinal BD patients.

Results: The prevalence of anemia was 60.38% in newly-diagnosed patients with intestinal BD, significantly higher than those with non-intestinal BD (27.80%). Patients with intestinal BD had lower Hb, higher levels of C-reactive protein (CRP) and higher erythrocyte sedimentation rates (ESR) than did patients with non-intestinal BD (P < 0.05). The majority of patients had mild-to-moderate anemia. The most common type of anemia found in both groups was normocytic normochromic anemia (56.25% for intestinal BD and 59.70% for non-intestinal BD). Multivariate logistic regression showed that the independent risk factors for anemia were disease activity index (DAIBD) (OR = 4.949, 95% CI: 1.504-16.282), higher levels of ESR (OR = 1.058, 95% CI: 1.019-1.099), and lower body mass index (BMI) (OR = 0.843, 95% CI: 0.727-0.977) for newly-diagnosed intestinal BD patients.

Conclusion: Anemia is common in patients with newly-diagnosed intestinal BD. Although typically mild or moderate, anemia may closely relate with disease activity.