RE: Glass-Based Radon Measurements

["Jacobus, John (NIH/OD/ORS)" <jacobusj@ors.od.nih.gov>]

Kai,

Excuse by ignorance, but could it be that in calculating the relative risk,

value is based on the number of cases per person-years of exposure.  Thus,

if the number of years exposed to that concentration is small, the relative

risk is higher.  



On the other hand, the odds ratio is just the number of cases presented,

without any consideration as to how long the person was exposed to that

concentration.



-- John 

John Jacobus, MS

Certified Health Physicist 

3050 Traymore Lane

Bowie, MD  20715-2024



E-mail:  jenday1@email.msn.com (H)      



-----Original Message-----

From: Kai Kaletsch [mailto:info@eic.nu]

Sent: Thursday, October 10, 2002 5:17 PM

To: RadSafe

Subject: Re: Glass-Based Radon Measurements





Friends,



For those interested in Radon, I have calculated the odds ratios from the

data given in the first 2 rows of Table 4 of the Lagarde et al. paper and

graphed them. These rows give the number of cases and controls as a function

of radon concentrations as assessed by air based and surface based

measurements respectively. The graph can be seen at

http://members.shaw.ca/eic/odds.pdf

Also shown on the graph (dashed lines) are the relative risks as reported by

the authors.



To me at least, it seems that the raw odds tell a different story than the

RR values.



Please let me know if I made any mistakes in calculating the odds ratios.

. . .

************************************************************************

You are currently subscribed to the Radsafe mailing list. To unsubscribe,

send an e-mail to Majordomo@list.vanderbilt.edu  Put the text "unsubscribe

radsafe" (no quote marks) in the body of the e-mail, with no subject line.

You can view the Radsafe archives at http://www.vanderbilt.edu/radsafe/