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What was the project about? Researchers often use data from patients’ health records to compare treatments. But many things—not just treatments—affect patients’ health. To figure out whether changes in patients’ health result from treatment or something else, researchers can use statistical methods called instrumental variables, or IVs. IV methods account for factors that affect health but aren’t in patients’ health records, such as eating habits. Existing IV methods work well when looking at health outcomes that are measured using certain types of scales, such as blood pressure. But existing methods don’t work as well to measure the time until a health event occurs, particularly when an event, like death, has not occurred for many patients in the study.

Developing Methods to Account for Bias from Unmeasured Sources When Analyzing Time Until a Health Event