Bruce Hocking's TV antenna/childhood leukemia study


15 May 2000

---------- Forwarded message ----------
Date: Wed, 10 May 2000 03:07:21 -0500 (CDT)
From: "Roy L. Beavers" <>
To: emfguru <>
Subject: Bruce Hocking study revisited (McLean)..

Hi everybody:

One of the more significant studies which suggest that RF/MW towers may pose a risk to those who live nearby is the childhood leukemia study that was done by Dr. Bruce Hocking of Australia.  His original findings - along with the results of his latest re-analysis of the data - are reported below.

Conclusion: "There was an association between proximity to the TV towers and decreased survival, among cases of childhood leukemia."

The risk factor (mortality rate ratio) was 2.1.  i.e., Those leukemia victims living within the inner ring (of proximity to the towers) had a death experience ratio that was 2.1 times that of those who lived in the outer ring (of proximity to the TV towers) in North Sydney, Australia.....

Our thanks to Lynn McLean for forwarding this important new information....


Roy Beavers (EMFguru)

It is better to light a single candle than to curse the darkness

People are more important than profits!!

---------- Forwarded message ----------
Date: Wed, 10 May 2000 17:21:28 +1000
From: "EMRAA (EMR Alliance Australia)" <>

Dear Roy

Here is an abstract of the poster presented at the Annual Scientific Meeting of the Royal Australasian College of Physicians in Adelaide SA, 2-5 May 2000 by Dr Bruce Hocking.   Dr Hocking previously reported a higher incidence of childhood leukemia around TV towers in north Sydney.

Best wishes
Lyn McLean

Decreased survival  for childhood leukaemia in proximity to TV towers

B Hocking FAFOM Consultant in Occupational Medicine   I Gordon PhD Statistical Consulting Centre University of Melbourne Parkville Vic Australia 3052

Abstract Objective. In a previous study we reported an increased risk of childhood leukaemia in municipalities proximate to TV towers in north Sydney compared with more distant ones (Hocking B Gordon I Hatfield G Grain H. Cancer incidence and proximity to TV towers Med J Aust 1996; 165: 601-605). The rate ratio for incidence, comparing the inner ring of municipalities to the outer ring, was 1.55 (95% confidence interval 1.00 – 2.41) and for mortality the rate ratio was 2.74 (95% confidence interval 1.42 – 5.27). The objective of the current study was to analyse the survival experience of the cases in detail, to determine whether there are differences between the two populations.

Design and Outcome Measures. Survival data on cases diagnosed from 1972-93 were analysed. Data on all cases who survived for less than one month were verified by the NSW cancer registry and one case diagnosed at autopsy excluded. Data were described by Kaplan-Meier curves. The log-rank and Wilcoxon tests were used to compare the two groups. Cox’s proportional hazards model was used to adjust for confounders.

Results. There were 123 diagnosed cases of acute lymphatic leukaemia (ICD-9 204.0) of which 29 (16 deaths) were in the inner ring of municipalities and 94 (34 deaths) were in the outer ring. We found a significant difference in survival (log rank: P = 0.03; Wilcoxon: P = 0.05). The 5 year survival in the inner ring of municipalities was 55% and in the outer ring 71% (inner 23% worse); at 10 years the survival was 33% and 62% respectively (inner 47% worse).  After adjustment for the potential confounders using Cox’s model, the mortality rate ratio comparing the inner ring with the outer ring was found to be 2.1 (95% confidence interval: 1.1 – 4.0). We were not able to control for cytogenetic abnormalities.

Conclusion . There was an association  between proximity to the TV towers and decreased survival, among cases of childhood leukaemia.

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