Re: Radon and Smoking

["Field, R. William" <bill-field@UIOWA.EDU>]

Kai,



We did not see any changes that would produce a 10% change.



The 10% difference is in Dr. Cohen's aggregate data.



We have data on individuals without lung cancer that show smoking is not 

related to the radon concentrations.  We have data on changes that occur 

after the lung cancer is diagnosed. We have data on fan usage, fireplace 

usage, window opening, whole house attic fan usage, stove top cooking fans, 

clothes dryer vents, room ceiling fans, candle usage, forced air furnace, 

gravity floor furnaces, electric heat, and on and on.  The data do not 

indicate any systematic effects that would bias the study.



Most people's heating bill is impacted by the temperature outside.



Bill





At 11:25 AM 02/12/2002 -0600, Kai Kaletsch wrote:

>Would that information be enough to indicate a 10% change?

>

>3 years ago we were blessed with a child. This is a big lifestyle change and

>probably affected the ventilation by a huge amount. However, I could not

>tell you if it increased or decreased the overall ventilation in the house.

>The doors were left open for shorter periods of time, but opened more

>frequently. The dryer and bathroom fan were on more often.

>

>Having been in the radon business for about 10 years in one way or another,

>I am probably more aware of things that affect ventilation than the average

>person. Could an average person be expected to recall everything that might

>affect ventilation? (Looking at the heating bill might give you an unbiased

>indication of changes in the winter ventilation.)

>

>Regards,

>

>Kai

>

>----- Original Message -----

>From: "Field, R. William" <bill-field@uiowa.edu>

>To: "Kai Kaletsch" <kai@eic.nu>

>Cc: <radsafe@list.vanderbilt.edu>

>Sent: Tuesday, February 12, 2002 10:57 AM

>Subject: Re: Radon and Smoking

>

>

> > Kai wrote:

> >

> > >I think what this comes down to, is that we really don't know how a lung

> > >cancer diagnosis affects the ventilation in a house.

> > >

> > >Kai

> >

> >

> > In the Iowa study, we collected information on window opening and other

> > individual behaviors and structural factors concerning ventilation during

> > the residency of the subject in the home so we do have that

> > information.  This is just one of the advantages you have with a

> > case-control study.

> >

> > Regards, Bill Field

> >



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