Date:         Mon, 14 Sep 2009 11:41:58 -0700
Reply-To:     "cat.." <cat.b41@GMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         "cat.." <cat.b41@GMAIL.COM>
Organization: http://groups.google.com
Subject:      Re: URGENT - Kaplan-Meier curves,
              95% CI and statistically significant difference
Comments: To: sas-l@uga.edu
Content-Type: text/plain; charset=ISO-8859-1

On Sep 13, 10:21 am, "cat.." <cat....@gmail.com> wrote:
> Hi there,
>
> I have limited experience in time-to-event data analysis. I requested,
> in a statistical analysis plan for an observational study, to plot theKaplan-Meiercurves 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.
>
> Catherine.

Has anyone an idea ?