Characteristics of 2,250,392 participants who underwent UGIS or endoscopy screening through the NCSP for gastric cancer, 2002–2005.

UGIS, upper-gastrointestinal series; NCSP, National Cancer Screening Program; NHI, national health insurance.aAll differences between participants who underwent UGIS screening and those who underwent endoscopy screening were statistically significant (pUGIS（upper-gastrointestinal series，上消化道造影）；NCSP（National Cancer Screening Program，国家癌症筛查计划）；NHI（national health insurance，国民健康保险）。注a：所有接受UGIS筛查的参与者与接受内镜筛查的参与者之间的差异均具有统计学显著性（p