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st: RE: Test for trend in IRRs

From   "Visintainer, Paul" <PAUL_VISINTAINER@NYMC.EDU>
To   <>
Subject   st: RE: Test for trend in IRRs
Date   Tue, 2 Aug 2005 11:34:13 -0400

I don't know whether -epitab- has an option to test for trends in the
IRR, but you can use -poisson-.  One approach is to create a variable
whose values are the midpoints (or medians) of your 5 age categories.
Then enter this variable in a poisson regression model. The advantage of
this approach is that you can include other covariates, as well.  

Paul F. Visintainer, PhD
Professor and Chairman 
Department of Epidemiology
School of Public Health
New York Medical College 
-----Original Message-----
[] On Behalf Of Daniel Pratt
Sent: Tuesday, August 02, 2005 6:30 AM
Subject: st: Test for trend in IRRs


I have calculated the following IRRs for suicide in
released prisoners:

Age     IRR
18-20   5.58
21-24   5.31
25-29   7.84
30-39   9.25
40-49  13.17
50+    15.59

Is there a formal test to see if the increasing trend
in the IRRs is significant?

Many thanks,


Centre for Suicide Prevention
The University of Manchester
Room A3.5, Humanities Building
Devas Street
M13 9PL
Tel:  0161 275 0722
Fax:  0161 275 0716

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