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Analysis of dynamic restricted mean survival time based on pseudo‐observations

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  • Zijing Yang
  • Chengfeng Zhang
  • Yawen Hou
  • Zheng Chen

Abstract

In clinical follow‐up studies with a time‐to‐event end point, the difference in the restricted mean survival time (RMST) is a suitable substitute for the hazard ratio (HR). However, the RMST only measures the survival of patients over a period of time from the baseline and cannot reflect changes in life expectancy over time. Based on the RMST, we study the conditional restricted mean survival time (cRMST) by estimating life expectancy in the future according to the time that patients have survived, reflecting the dynamic survival status of patients during follow‐up. In this paper, we introduce the estimation method of cRMST based on pseudo‐observations, the statistical inference concerning the difference between two cRMSTs (cRMSTd), and the establishment of the robust dynamic prediction model using the landmark method. Simulation studies are conducted to evaluate the statistical properties of these methods. The results indicate that the estimation of the cRMST is accurate, and the dynamic RMST model has high accuracy in coefficient estimation and good predictive performance. In addition, an example of patients with chronic kidney disease who received renal transplantations is employed to illustrate that the dynamic RMST model can predict patients’ expected survival times from any prediction time, considering the time‐dependent covariates and time‐varying effects of covariates.

Suggested Citation

  • Zijing Yang & Chengfeng Zhang & Yawen Hou & Zheng Chen, 2023. "Analysis of dynamic restricted mean survival time based on pseudo‐observations," Biometrics, The International Biometric Society, vol. 79(4), pages 3690-3700, December.
    • Handle: RePEc:bla:biomet:v:79:y:2023:i:4:p:3690-3700
    DOI: 10.1111/biom.13891
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    References listed on IDEAS

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