Date: Sun, 13 Sep 2009 02:21:09 -0700
Reply-To: "cat.." <cat.b41@GMAIL.COM>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: "cat.." <cat.b41@GMAIL.COM>
Subject: URGENT - Kaplan-Meier curves,
95% CI and statistically significant difference
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I have limited experience in time-to-event data analysis. I requested,
in a statistical analysis plan for an observational study, to plot the
Kaplan-Meier curves for 2 groups of patients on a single plot,
together with the 95% CIs at specific timepoints.
When 95% CIs do not overlapp at a given timepoint, is it correct to
draw the conclusion that disc rates are significantly different at
this timepoint ?
Reversely, when they overlapp, is it correct to infer that the disc
rates at that timepoint are NOT significantly different ?
Thanks for your feedback. This is quite urgent as I need to give my
feedback early this coming week.