Use of alternative time scales in Cox proportional hazard models: implications for time-varying environmental exposures.

Use of alternative time scales in Cox proportional hazard models: implications for time-varying environmental exposures.
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DOI:
10.1002/sim.5347
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发表时间:
2012-11-30
影响因子:
2
通讯作者:
Whitsel, Eric A.
Whitsel, Eric A.
中科院分区:
医学3区
文献类型:
--
作者:
Griffin, Beth Ann;Anderson, Garnet L.;Shih, Regina A.;Whitsel, Eric A.

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围绕 Cox 比例风险回归模型中时间尺度选择的问题在文献中受到的关注有限。尽管已经对研究时间和“达到”年龄时间尺度之间的选择进行了审查,但在对具有值得注意的长期趋势(例如大型流行病学队列研究中的环境颗粒物空气污染)的环境暴露的健康影响进行建模时,日历时间尺度可能会更有意义。当感兴趣的主要暴露取决于日历时间时,作者使用模拟研究来检查使用所有三个时间尺度的模型的性能(偏差、均方误差、覆盖概率和功效)。结果表明,适合日历时间尺度的模型性能与随时间变化的主要暴露和日历时间之间的线性关联强度成反比。尽管适合达到年龄和研究时间且不根据日历时间进行调整的模型相对稳健,但作者得出的结论是,在使用与感兴趣的暴露高度相关的时间尺度时应谨慎行事。
Issues surrounding choice of time scales in Cox proportional hazard regression models have received limited attention in the literature. Although the choice between time on study and ‘attained’ age time scales has been examined, the calendar time scale may be of interest when modeling health effects of environmental exposures with noteworthy secular trends such as ambient particulate matter air pollution in large epidemiological cohort studies. The authors use simulation studies to examine performance (bias, mean squared error, coverage probabilities, and power) of models using all three time scales when the primary exposure of interest depends on calendar time. Results show that performance of models fit to the calendar time scale varies inversely with the strength of the linear association between the time-varying primary exposure and calendar time. Although models fit to attained age and time on study that do not adjust for calendar time were relatively robust, the authors conclude that care should be exercised when using time scales that are highly correlated with exposures of interest.
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