Study type:
Epidemiological study
(observational study)
Residential exposure to electric power transmission lines and risk of lymphoproliferative and myeloproliferative disorders: a case-control study
epidem.
By:
Lowenthal RM, Tuck DM, Bray IC
Published in: Intern Med J 2007; 37 (9): 614-619
Aim of study (acc. to author)
Endpoint/type of risk estimation
Type of risk estimation:
(odds ratio (OR))
Exposure
Assessment
- list: complete residential histories
- calculation: lifetime residential proximity to power lines based on address and power grid in Tasmania comprising lines of 88, 110 or 220 kV
Exposure groups
Group
|
Description
|
Group 1
|
closest distance ever lived to a power line: > 300 m
|
Group 2
|
closest distance ever lived to a power line: 51 - 300 m
|
Group 3
|
closest distance ever lived to a power line: 0 - 50 m
|
Group 4
|
distance to power line 0 - 300 m: 0 - 15 years of age
|
Group 5
|
distance to power line 0 - 300 m: 15 years before diagnosis
|
Group 6
|
distance to power line 0 - 300 m: ever versus never
|
Group 7
|
distance to power line 0 - 300 m, residence only in Tasmania: 0 - 15 years of age
|
Group 8
|
distance to power line 0 - 300 m, residence only in Tasmania: 15 years before diagnosis
|
Group 9
|
distance to power line 0 - 300 m, residence only in Tasmania: ever versus never
|
Group 10
|
distance to power line 0 - 300 m: 0 - 5 years of age
|
Group 11
|
distance to power line 0 - 300 m: 6 - 17 years of age
|
Group 12
|
distance to power line 0 - 300 m: ≥ 18 years of age
|
Group 13
|
distance to power line 0 - 300 m, residence only in Tasmania: 0 - 5 years of age
|
Group 14
|
distance to power line 0 - 300 m, residence only in Tasmania: 6 - 17 years of age
|
Group 15
|
distance to power line 0 - 300 m, residence only in Tasmania: ≥ 18 years of age
|
Population
-
Group:
-
Age:
0–94 years
-
Observation period:
1972 - 1980
-
Study location:
Australia (Tasmania)
Case group
-
Characteristics:
lymphoproliferative and myeloproliferative disorders
-
Data source:
histopathology and haematology laboratories in Tasmania, Australia
Control group
-
Selection:
-
Matching:
- sex
- 5-years age group
- case:control = 1:1
Study size
|
Cases |
Controls |
Participants |
854 |
854 |
Statistical analysis method:
- conditional logistic regression
(
adjustment:
)
Results (acc. to author)
19 patients (2.2 %) and 9 control persons (1.1 %) had ever lived within 50 m to a power transmission line, 75 patients (8.8 %) and 55 control persons (6.5 %) in the distance of 51 to 300 m.
Persons who had ever lived within 50 m to a power transmission line had a non significantly increased risk (OR 2.06, CI 0.87 - 4.91) for developing lymphoproliferative or myeloproliferative disorders compared to the group who had always lived in the distance of more than 300 m. There was also an increased risk (OR 1.30, CI 0.88 - 1.91) associated with having lived 51 to 300 m from a power line. Adults who had lived within 300 m from a power line between birth and 15 years of age had a significantly increased risk (OR 3.23, CI 1.26 - 8.29), persons who had lived within the same distance between birth and 5 years had a higher risk (OR 4.74, CI 0.98 - 22.9). These association were strenghtended for the matched pairs who had only lived in Tasmania.
The authors concluded that the results raise the possibility that prolonged residence close to power transmission lines, especially early in life, may increase the risk of developing lymphoproliferative and myeloproliferative disorders.
Limitations (acc. to author)
The number of subjects available for analysis was small.
Study funded by
-
Clifford Craig Medical Research Trust (CCMRT), Tasmania, Australia
-
David Collins Leukaemia Foundation (DCLF), Tasmania, Australia
-
Royal Hobart Hospital Medical Research Foundation, Tasmania, Australia
-
University of Plymouth, UK
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