̶ Methods and Their Application to Epidemiology on Cancer and Radiation ( 2 )
نویسنده
چکیده
A cohor t is a fixed population. Its membership is permanent (even after death)8, 14). Examples are as follows: people born in Kagoshima, and the alumni of Hirosaki University. A cohort study follows a fixed population. Unfixed populations are called dynamic populations (open populations). The membership of a dynamic cohort is not permanent. Examples are as follows: Hirosaki University students – The students of Hirosaki University are members of a dynamic population, which can be called Hirosaki University Student Population. When students graduate from Hirosaki University, they lose the membership. Kagoshima City residents. – People who live in Kagoshima City constitute a dynamic population, which
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