Hematological data, median (range)WBC count (109/L)Hemoglobin level (g/L)Neutrophil count (109/L)Platelet count (109/L)C-reactive protein (mg/L)Albumin level (g/L)PT(S)APTT(S)FIB (g/L)Abscess range > 5 cm, n (%)Depth of abscess > 5 cm, n (%)Complex anal fistula, n (%)Operation time > 30 min, n (%)CT > 4 times, n (%)Underwent MRI, n (%). Here, CRP is linked to Anal fistula.