topic Overlapping cohort in time eras in cox analysis in Statistical Procedures

Overlapping cohort in time eras in cox analysis

gc_ut — Fri, 11 Nov 2016 02:58:16 GMT

HI, I have come across an issue regarding overlapping cohorts two time-dependent eras.

I want to see if a specific time period (Era 1 vs Era 2) has affected patients waiting on a list for heart transplant.

However, the patients in Era 1 overlap into Era 2. I do not want to exclude the patients who overlap into Era 2.

Is there way that SAS to do a multivariate cox regression analysis that will allow for these overlapping cohorts when looking at the effect of an Era (Era 1 vs Era 2).

Re: Overlapping cohort in time eras in cox analysis

PGStats — Fri, 11 Nov 2016 05:02:35 GMT

Did an abrupt change occur between Era1 and Era2?

You could censor overlapping patients at the end of Era1.

Re: Overlapping cohort in time eras in cox analysis

gc_ut — Fri, 11 Nov 2016 15:49:55 GMT

Is there a way that I can conduct the analysis without censoring the overlap. I hope to include the overlapped patients.