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st: pooling incidence rates

From   Sripal Kumar <[email protected]>
To   statalist <[email protected]>
Subject   st: pooling incidence rates
Date   Sat, 23 Jan 2010 13:07:46 -0500


I am trying to estimate the incidence of a particular adverse effect
from RCTs published so far.  The way I have pooled the incidence rate
is to weigh each trial by the inverse of the variance just like a
standard meta analysis.  My question is what do I do if the studies
have different lengths of follow up?  Should I calculate the incidence
rate for each study per person-year observation and then pool them by
weighting each study by the inverse of their variance? For clinical
interpretation and to compare this against published data, I need to
report the data as number per 100 patients exposed rather than number
per 100 patient-years of observation.

thanks in advance,
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