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Re: Another (partial) literature review (radon)
Tom,
Why is this a bias? They were likey setting exposure categories so that
their results could be comparable with som of the U.S. studies.
>From: "Bjorn Cedervall" <bcradsafers@HOTMAIL.COM>
>Reply-To: "Bjorn Cedervall" <bcradsafers@HOTMAIL.COM>
>To: radsafe@list.vanderbilt.edu
>Subject: Re: Another (partial) literature review (radon)
>Date: Mon, 14 Jan 2002 16:27:02 +0000
>
>Thank you! A better way to stratify the data may be to randomize the
>intervals and use some average to get away from this kind of bias. The same
>problem seems to be true for some power line/leukemia studies.
>
>Bjorn Cedervall bcradsafers@hotmail.com
>------------------------------------------
>>The radon action levels in most of Europe is 200 Bq/m^3 for new
>>construction and 400 Bq/m^3 for old houses. The authors stratified the
>>data
>>for (values in Bq/m^3) <50, 50-100, 101-200, 201-400, >400. But their data
>analysis used grouping of (values in Bq/m^3): <50, 50-80, 80-140, and >140,
>which coincides with the U.S. EPA levels. I found this change curious.
>The authors report a RR of 1.55 for >140 Bq/m^3.
>
>The European classification is still positive, but the number of cases is
>low enough to change the results significantly with a single addition or
>deletion of a case in any group above 200 Bq/m^3.
>RR (measured results) for 101-200: 1.15, 201-400: 1.15, >400: 1.20
>
>
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