I have data from patients who underwent tests at different time points. Some underwent 10 times over 1 year and some 100 times over 20 years. I want to analyse whether drop in a variable measured at those times was significant cause of an event like death. For example one patient had blood pressure measured at 1, 3,7 weeks. Another at 2, 6,9, 66, 98 weeks. So if drop in blood pressure at time was significant cause of death.
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