Table 1

Clinical characteristics of 298 study participants

Variablen (%)
Age, years, mean±SD50.8±15.9
Men (%)174 (58.4)
Disease extent (pancolitis/left-sided/proctitis/others)125/80/86/7
Duration of UC, year, mean±SD8.6±8.7
BMI, kg/m2, mean±SD22.81±4.71
Current smoking (%)25 (8.4)
Current alcohol intake (%)123 (41.3)
Medication
 5-Aminosalicylates (%)248 (90.8)
 Prednisolone (%)62 (20.8)
 Thiopurines (%)444 (14.8)
 TNF-α monoclonal antibody (%)18 (6.0)
 Mayo endoscopic subscore, mean±SD1.20±0.91
 Mucosal healing (Mayo endoscopic subscore 0 and 1) (%)186 (62.4)
 Complete mucosal healing (Mayo endoscopic subscore 0) (%)75 (25.2)
Education, years
 Low (≤12 years) (%)149 (50.0)
 Moderate (12–16 years) (%)63 (21.1)
 High (≥16 years) (%)86 (28.9)
Household income, Japanese yen/year
 Low (≤2 999 999) (%)63 (21.1)
 Moderate (3 000 000–5 999 999) (%)139 (46.6)
 High (≥6 000 000) (%)96 (32.2)
  • Others: right-sided, segmental colitis and postoperative patients (lack of any preoperative medical records of postoperative patients).

  • BMI, body mass index; TNF, tumour necrosis factor; UC, ulcerative colitis.