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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 Pack year ： ウィキペディア英語版 Pack-year A pack-year is a quantification of cigarette smoking. ==Definition== The pack-year is a unit for measuring the amount a person has smoked over a long period of time. It is calculated by multiplying the number of packs of cigarettes smoked per day by the number of years the person has smoked. For example, 1 pack-year is equal to smoking 20 cigarettes (1 pack) per day for 1 year, or 40 cigarettes per day for half a year, and so on.〔http://www.cancer.gov/dictionary?CdrID=306510 National Cancer Institute definition of pack year〕 One pack-year is the equivalent of 365.24 packs of cigarettes or 7,305 cigarettes. 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「Pack-year」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.