Impact of endoscopic screening on mortality reduction from gastric cancer

Figure 1 Flowchart for the selection of the target population. The target population consisted of participants of gastric cancer screening by endoscopy, regular radiography, and photofluorography at Niigata city, in 2005. The total number of participants of the gastric cancer screening in 2005 was 54264. The target population of this study was defined as individuals whose ages ranged from 40 years to 79 years; individuals belonging to the age group of 80 years and over were excluded from the study. The final numbers of subjects for the defined age group were 16373 for the endoscopic screening, 18221 for the regular radiographic screening, and 15927 for the photofluorography screening.