GSTM1 and ulcerative colitis: n (number of participants), CD (Crohn’s disease), UC (ulcerative colitis), HC (healthy control), HBI (Harvey-Bradshaw Index), pMayo (partial Mayo score), CRP (C-reactive protein), FC (fecal calprotectin), Hb (hemoglobin), PLT (platelet count), WBC (white blood cells), ns (not significant), NA (not available).