Re: Source of cancer data

[Muckerheide <muckerheide@MEDIAONE.NET>]

 From: "John Williams" <JohnWi@law.com>



The primary factor in a 'case-control' study is knowing the dose to the

individual. Radon case-control studies do NOT know the dose to the

individual. They are bad case-control studies, and poor epi because the

groups are too small to produce credible statistics (demonstrated in a study

as wide error bars, and in many studies by many different dose-response

results, unlike large ecological studies by Cohen and others which produce

both small error bars and consistent results in hundreds of studies.



Discounting good studies in favor of bad/indeterminate studies is

non-scientific political/funding-motivated disinformation.



Jim

 

> Ruth,

> 

> In a case control study, the control of confounding such as smking

> rate and duration is performed at the level of the individual.  The

> interviewer asks each respondent about thir smoking history.  I used

> smoking as an example, but it also relates to other data that is

> collected.  In the ecologic study, Cohen used sales tax to infer

> smoking rates for the county.

> 

> 

> 

> Sent by Law  Mail

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