Person_Time
Person_Time : A unit of measurement combining persons and time, used as denominator in instantaneous incidence rates. It is the sum of individual units of time that the persons in the study population have been exposed to the condition of interest. A variant is person_distance, e.g., as in passenger_miles. The most frequently used person_time is person_years. With this approach, each subject contributes only as many years of observation to the population at risk as he is actually observed; if he leaves after one year, he contributes one person_year; if after ten, ten person_years. The method can be used to measure incidence over extended and variable tiffs periods. [Last, 1983: A Dictionary of Epidemiology]
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