标题： Lexis空间中快速计算与日历时间、年龄和持续期相关的风险时间 显示英文标题

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

摘要： 在流行病学中，人年法被广泛用于估计与健康相关事件的发病率。 这需要根据时间段、年龄以及有时根据疾病或暴露持续时间来确定风险时间。 本文描述了一种基于Siddon算法的快速计算Lexis图（二维或三维）中风险时间的方法。 显示英文摘要

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