Table 3.

Estimated costs and effectiveness of gastric cancer screening programs

	Model I		Model II
	Upper GI X-ray	Upper endoscopy	Upper GI X-ray	Upper endoscopy
Probability of gastric cancer (n)	0.000836	0.002386	0.000836	0.002386
Unit cost, US$ (a)	44.37	40.33	37.14	40.33
Cost to detect one case of gastric cancer (a/n)	53 094.64	16 900.43	44 445.78	16 900.43
Reduction in cost to detect one case of gastric cancer		36 194.21		27 545.35

Model I: Including screening test costs and confirmation test costs, if the results of upper GI X-ray were abnormal; Model II: Including screening test costs only.