1. Identified criteria of high-risk population in cancer screening program.

Identified items	Score
*, Subjects were asked to reply the items above, and a summary score was added up for identification of high-risk individual.
1. Smoking: 20 cigarettes per day for more than 10 years	1
2. Drinking: half a liter of liquor per week for more than 10 years	1
3. Eating pickled vegetables often	1
4. Eating processed meat often	1
5. Hot-eating habit	1
6. High-salt diet	1
7. Family history of upper gastrointestinal cancer	2
8. Family history of liver cancer	2
9. Any current symptom of dysphagia, odynophagia, chest pain, back pain, neck pain	2
10. Any current symptom of nausea and vomiting, anorexia, melena	2
11. Any current symptom of abdominal distension, anorexia, nausea and vomiting	2
12. Jaundice and edema	2
13. Progressive emaciation	2
High-risk individual for esophageal cancer*: any two items among 1−5; or any one item of 7/9/13	≥2
High-risk individual for stomach cancer*: any two items among 1−4 and 6; or any one item of 7/10/13	≥2
High-risk individual for liver cancer*: any two items among 1−3; or any one item of 8/11/12/13	≥2