Table 1. Demographic and clinical characteristics.

	Patients who underwent gastroduodenoscopy (n = 37)	Patients who underwent colonoscopy (n = 17)
Age, years	54.7 ± 14.2	49.2 ± 17.1
Gender, n (%)
Male	25 (67.6)	13 (76.5)
Female	12 (32.4)	4 (23.5)
Clinical manifestations, n (%)
Stomach pain	30 (81.1)	Diarrhea	10 (58.9)
Abdominal distension	22 (59.5)	Hematochezia	7 (41.2)
Heartburn	5 (23.5)	Constipation	6 (35.3)
Screening	6 (16.2)	Screening	4 (23.5)
Pathological diagnosis, n (%)
Chronic gastritis	26 (70.3)	Ulcerative colitis	5 (29.4)
Gastric polyp	4 (10.8)	Colon cancer	1 (5.9)
Gastrointestinal stromal tumor	1 (2.7)	Graft-versus-host disease	1 (5.9)
Mucosa-associated lymphoid tissue lymphoma	2 (5.4)	Colon polyp	7 (41.2)
Gastric ulcer	2 (5.4)	Rectum carcinoid	1 (5.9)
Gastric cancer	2 (5.4)	Normal colon tissue	2 (11.8)