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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Canadian National Breast Screening Study ： ウィキペディア英語版 Canadian National Breast Screening Study The Canadian National Breast Screening Study, sometimes abbreviated as CNBSS or NBSS, was a randomized trial conducted with the aim of evaluating whether mammography reduced breast cancer incidence or mortality among women who underwent screening. The trial was initiated in 1980, and was conducted in fifteen screening centers in six different Canadian provinces.〔 It was the first study designed to determine whether mammography was effective among women between the ages of 40 and 49. ==Methodology== In the CNBSS, nearly 90,000 women were randomly assigned to either undergo mammographic screening annually, or not undergo it, for five years (1980-1985).〔 The women who participated in the study were aged 40–59, and were divided into two groups: the age 40-49 group and the age 50-59 group.〔 The women aged 40–49 in the mammography group also received annual breast exams, as did the women aged 50–59 in both the mammography and control groups.〔 The women aged 40–49 in the control group received only one breast exam, after which they were told to remain under the care of their family doctor.〔〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Canadian National Breast Screening Study」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.