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随机从明尼苏达州Ｏｌｍｓｔｅｄ县４０～７９岁人口中选择２１１５名老年男性（５５％回答率），参加者先完成基础问卷来评估症状的严重性，并用便携式尿流率检查仪测定尿流率。随机选取２５％的参加者通过经直肠超声测量前列腺体积并查血清前列腺特异性抗原。随访包括社区医?
2115 elderly men (55% response rate) were randomly selected from 40 to 79-year-olds in Olmsted County, Minnesota. Participants completed the basic questionnaire to assess the severity of the symptoms and the urinary flow rate using a portable urine flow tester. Twenty-five percent of participants were randomly selected to measure prostate volume via transrectal ultrasound and to examine serum-specific prostate-specific antigens. Follow-up includes community medicine?