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st: Once more - combining confidence intervals?


From   Alan Kelly <[email protected]>
To   [email protected]
Subject   st: Once more - combining confidence intervals?
Date   Thu, 23 Jan 2003 10:28:50 +0000

Dear all,
A little surprised that I had no takers on the following question (posted on the 17th).
I'm trying again - just in case!
best wishes,
Alan Kelly


Dear all,
Following stratified modelling (log-linear) to derive a population prevalence, I have a number of point prevalence estimates and their associated confidence intervals for various age/sex groups (15 - 24 years, 25 - 34 years and 35 - 54 years for males and females separately). I need to have an estimate of the prevalence for the entire 15 - 54 population. Fitting a global model produces a very poor fit (due to heterogeneity). Summing the point estimates to obtain an overall prevalence seems reasonable. However, although I have seen this done, summing the individual lower and upper confidence intervals to give a CI for the total prevalence does not seem intuitive to me...for a start, the individual age/sex standard errors are based on different numbers of individuals.
Any suggestions as to how I could tackle the above would be appreciated.
best wishes,
Alan Kelly
+-------------------------------------------------------+
Dr. Alan Kelly E-mail [email protected]
Biostatistician Phone: +353-1-608 1385 or 608 1087
Fax: +353-1-403 1211 or 403 1212



Director of the Small Area Health Research Unit
Department of Community Health & General Practice
Trinity Center for Health Sciences
AMNCH
Tallaght Hospital
Dublin 24
Ireland

http://www.tcd.ie/Community_Health/SAHRU/index.html
+--------------------------------------------------------+
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