I am working on a longitudinal project with an enormous dataset (over 1.5 million participants). I am looking at their survival based on several factors including some measure of disease and age. I have been able to plot KM curves through proc lifetest, and adjusted KM curves using the baseline statement in proc phreg. The investigator I am working for, however, does not feel that Kaplan Meier curves or hazard rates are intuitive from a clinician point of view. He said that clinicians expect to see a "Restricted Mean Survival Time Curve." RMST is defined as the area under the survival curve up to a point t*. I have attached an example of the type of result I am looking for to this post. I have been unable to find anything regarding how to generate such a curve. If you notice, instead of survival probability on the Y-axis, it is Mean Survival Time, and on the X-axis it is age rather than time. For each of my participants, I have starting age, degree of disease (a categorical variable with 5 levels), and date of death/age at death. I have seen many items regarding calculating a RMST at a point in time, but I have not seen anything about generating this type of curve in SAS. Any guidance would be much appreciated. Thank you
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