Need Help: Kaplan Meier analysis

#1
Hi

I have a large database and have generated KP curves for long term survival but there is not difference in overall/long term survival. Our goal is to evaluate if there is a difference in one year survival and looking at the curve, it looks like there is difference at 1-yr interval. I was wondering, how do I calculate the one year survival only along with CIs. Thanks. (using SPSS)
 

Karabiner

TS Contributor
#2
If you choose your hypothesis after you have inspected the data and have spotted some intereresting pattern there, the p-value of the test tends to be meaningless. By eyeballing the data one implicitly performs a large number of non-formal "tests", but these preliminary tests are nowhere accounted for in the final analysis.

As a technical note, you could create new variables for status at year 1 and for survival time at year 1.

With kind regards

K.