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In epidemiology, the person-years method is broadly used to estimate theincidence rates of health related events. This needs determination of time atrisk stratified by period, age and sometimes by duration of disease orexposition. The article describes a fast method for calculating the time atrisk in two- or three-dimensional Lexis diagrams based on Siddon's algorithm.

Fast Calculation of Calendar Time-, Age- and Duration Dependent Time at Risk in the Lexis Space