Subject: (Maxey) Linet & McBride vs. EPRI (fwd)
Date: Mon, 3 May 1999 202205 -0500 (CDT)
From: "Roy L. Beavers" <rbeavers@llion.org>
To: emfguru <rbeavers@llion.org>
--------------------------------------------------
......This is worth taking a little bit of time ... be sure you
understand what Dr. Maxey is pointing out here.....!!!
Roy Beavers (EMFguru)
rbeavers@llion.org................
...It is better to light a single candle than to curse the darkness...
.................PEOPLE ARE MORE IMPORTANT THAN PROFITS...............
---------- Forwarded message ----------
Date: Mon, 3 May 1999 19:59:30 -0500
From: Edward S Maxey
To: rbeavers@llion.org
Subject: Linet & McBride vs. EPRI
Hello Roy,
There are close similarities between the McBride Canadian study
and the Linet study in the United States.
Neither is compatible with the EPRI 1000 home study.
Some on your list may be interested in the following comparisons:
"Power-Frequency Electric and Magnetic Fields and Risk of Childhood
Leukemia in Canada" (M. L. McBride et. al., American Journal of
Epidemiology, Vol. 149, No.9) contains:
"Table 4. Risk of childhood leukemia in relation to personal magnetic
field exposure (48-hour time-weighted average, temperature corrected),
five Canadian provinces, 1990-1995
------------------------------------------------------------
Magnetic field level No of Cases
------------------------------------------------------------
Contemporaneous measure Percentile
<50 (<0.8 mG) 149
50-<75 (0.8-<1.5 mG) 67
75-<90 (1.5-<2.7 mG) 45
>=90 (2.7-16.1 mG) 32"
Note: Values converted from microtesla to milligauss and
extraneous data not shown.
There are 293 cases. Less than 50% requires that 146 rather than
149 cases be in the <50% group. If one assumes a linear spread of
cases the 0.8 mG level can be adjusted to 0.784 mG to arrive at the
median magnetic field exposure for these 293 cases.
The New England Journal of Medicine
Linet, N.E.J.M. 1997;337:1-7
Table 2. Risk of Childhood Acute Lymphoblastic Leukemia According
To Time-Weighted Average Summary Levels of 60-Hz Residential
Magnetic Fields In The Unmatched And Matched Analysis
Magnetic-Field
Level (mG) No. Of Case Patients
<0.65 267
0.65-0.99 123
1.00-1.99 151
=>2.00 83
Note: Values converted to milligauss from microtesla in the
original.
There are 624 cases. If one assumes a linear spread in the
0.65-0.99 segment the <0.65 value can be adjusted to 0.778 mG to
arrive as the median magnetic field exposure for these 624 cases.
These two medians are remarkably close. Lumping the McBride and
Linet studies together we have 917 cases of childhood leukemia with
an average median magnetic field exposure of 0.78 mG.
The Electric Power Research Institute
EPRI TR-102759-V2 September 1993
Table S-6: Spot Measurements and Combined Power
Line/Grounding System Fields
Median Spot Median Combined Field
Measurement Power Line/Grounding
(992 residences) (986 residences)
Values exceeded in (mG) (mG)
50% of the residences 0.5 0.5
25% of the residences 1.0 1.0
10% of the residences 1.7 1.8
5% of the residences 2.6 2.5
1% of the residences 5.8 5.5
This study did not include any Canadian residences but did include
36 cases from Long Island Lighting Company, 36 from Niagara Mohawk
Service Company, 36 from Massachusetts Electric company, 36 from
Northern States Power Company, 36 from Pennsylvania Power & Light
Company, 36 from Seattle City Light and 36 from Wisconsin Electric
Power Company. Areas just across the border from Canada are well
represented in this study. It is not unlikely that an EPRI type
study in Canada would find a residential median magnetic field
exposure very close to the value EPRI determined for the United States.
Why is the residential magnetic field median for homes of 917 North
American leukemia victims 56 percent higher than that of the 986
residences in the EPRI study?
How does one go about getting cancer researchers to explain this
disparity?
Very Sincerely,
E. Stanton Maxey, M.D.
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Reprinted with permission of Roy Beavers, http://www.feb.se/EMF-L/EMF-L.html