Thank you very much for the help! One more follow up question- For the same patient population i tried to calculate median duration of follow-up . Used proc univariate . for the stable group median follow up from surgery to last follow-up is 2.1 years (IQR, 0.5-4.6) for progression group, median duration of follow-up from surgery to progression is 1.6 years (IQR, 0.9- 5.7) for overall cohort, median duration of follow-up is 2.1 years (0.7, 5.4) The median PFS for the entire cohort was 6.06 years (95% Cl, 3.73-9.21) using the code proc lifetest data=red.data; time time2*progression1(0); run; I am wondering how do we explain median follow-up of 2.1 years and PFS of 6.06 years. How is PFS so large when median follow up is only 2.1 years. Thank you very much in advance. Really appreciate all your help!
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