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.
-p
______________________________
Paul F. Visintainer, PhD
Professor and Chairman
Department of Epidemiology
School of Public Health
New York Medical College
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Daniel Pratt
Sent: Tuesday, August 02, 2005 6:30 AM
To: [email protected]
Subject: st: Test for trend in IRRs
Hi,
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,
Daniel.
Centre for Suicide Prevention
The University of Manchester
Room A3.5, Humanities Building
Devas Street
Manchester
M13 9PL
Tel: 0161 275 0722
Fax: 0161 275 0716
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