随机在农村抽样700个居民,571人同意作为自愿者接受内镜检查。男322例,女149例。15～25岁青少年196例,26～66岁成年人375例。其中198例近3个月内有上腹隐痛、烧心、腹胀、嗳气等消化下良症状:另外373例既无消化系统症状,也无胃炎及溃疡病史。内镜检查前1周控制吸烟、饮酒、禁服止酸剂、H_2受 A random sample of 700 residents in rural areas, 571 people agreed to accept endoscopy as a volunteer. 322 males and 149 females. 196 cases of 15-25 years old adolescents, 375 cases of 26-66 years old adults. Among them, 198 cases had abdominal pain, heartburn, abdominal distention, belching and other symptoms of digestion during the recent 3 months: 373 patients had neither digestive symptoms nor gastritis and ulcers. One week before the endoscopy control smoking, alcohol, forbidden acid, H_2 by