Thank you for your reply. I'm sorry I didn't make it clear: I am interested
in the increase in risk across categories of AST
From: Ronan Conroy <rconroy@r...>
Date: Mon Jan 27, 2003 2:41 pm
Subject: Re: st: Test of person-times in stptime
on 24/01/2003 3:18 pm, Wagner, Joseph H at Joseph.Wagner2@m... wrote:
> . stptime if noliverdx==1, by(astlevel) per(1000) dd(4)
>
> failure _d: died
> analysis time _t: (censdate-origin)
> origin: time consent
> id: patient
> (342 missing values generated)
>
> astlevel | person-time failures rate [95% Conf. Interval]
> -----------+-----------------------------------------------------------
> AST<0.5 | 1531153.0004 55 0.0359 0.0276 0.0468
> AST 0.5<1 | 1973301.9990 94 0.0476 0.0389 0.0583
> AST 1<2 | 518659.9998 36 0.0694 0.0501 0.0962
> AST 2+ | 137030.0007 28 0.2043 0.1411 0.2959
> -----------+-----------------------------------------------------------
> total | 4160144.9999 213 0.0512 0.0448 0.0586
>
> I have been asked to do a test between the different person-times. Is it
> possible to do this in STATA?
What are you being asked to test? The hypothesis that follow-up is longer in
the case of those who have lowest levels of AST? Or the increase in risk
across categories of AST? It's not clear from your posting.
Ronan M Conroy (rconroy@r...)
Lecturer in Biostatistics
Royal College of Surgeons
Dublin 2, Ireland
+353 1 402 2431 (fax 2329)
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