calculated estimated survival rate at a certain time point (say, 18 months) with 95% CI and p value

[fengyuwuzu]

I want to calculate estimated survival rate with 95% CIs at a time point and compare the two arms with a p value. can Proc Phreg do this?

Thanks in advance.

[whymath]

Check this: https://communities.sas.com/t5/Statistical-Procedures/Estimating-the-cumulative-rate-and-CI-at-a-cer...

And there is an Chinese article: https://html.rhhz.net/zhlxbx/201502019.htm