Adjusted restricted mean survival times in observational studies.
Adjusted restricted mean survival times in observational studies.
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DOI:
10.1002/sim.8206
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发表时间:
2019-09-10
影响因子:
2
通讯作者:
Trinquart L
中科院分区:
文献类型:
--
作者:
Conner SC;Sullivan LM;Benjamin EJ;LaValley MP;Galea S;Trinquart L
In observational studies with censored data, exposure-outcome associations are commonly measured with adjusted hazard ratios (HRs) from multivariable Cox proportional hazards models. The difference in restricted mean survival times (RMST) up to a pre-specified time point is an alternative measure that offers a clinically meaningful interpretation. Several regression-based methods exist to estimate an adjusted difference in RMSTs, but they digress from the model-free method of taking the area under the survival function. We derive the adjusted RMST by integrating an adjusted Kaplan-Meier estimator with inverse probability weighting (IPW). The adjusted difference in RMSTs is the area between the two IPW-adjusted survival functions. In a Monte Carlo-type simulation study, we demonstrate that the proposed estimator performs as well as two regression-based approaches: the ANCOVA-type method of Tian et al and the pseudo-observation method of Andersen et al. We illustrate the methods by re-examining the association between total cholesterol and the 10-year risk of coronary heart disease in the Framingham Heart Study.
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