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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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