The potential parameters were considered based on accessibility and clinical simplicity. Data of UC patients were collected from the electronic medical database of our center, including general demographic and clinical characteristics: sex, age (year), body mass index (kg/m2), age of onset (year), fever (temperature ≥37.3°C), abdominal pain and hematochezia, stool frequency, complications or comorbidities; Blood biomarkers: Vit D (ng/ml), folate (ng/ml), vitamin B12 (pg/ml), ALB (g/L) prealbumin (PAB, mg/L), retinol-binding protein (mg/L), ferritin (ng/mL), Fbg (g/L), white blood cell count (*109/L), neutrophil count (*109/L), monocyte count (*109/L), lymphocyte count (*109/L), platelet count (*109/L), hemoglobin (g/L) and erythrocyte sedimentation rate (mm/H), and fecal occult blood test. All predictors were collected within 1 week before or after colonoscopy.
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