Study type:
Epidemiological study
(observational study)
Electromagnetic Fields and Cancer in Children Residing Near Norwegian High-Voltage Power Lines
epidem.
By:
Tynes T, Haldorsen T
Published in: Am J Epidemiol 1997; 145 (3): 219-226
Aim of study (acc. to author)
Further details
Endpoint/type of risk estimation
Type of risk estimation:
(odds ratio (OR))
Exposure
Assessment
- calculation: based on the distance of the address to the closest lines including height of towers, distance between phases, ordering of phases, historical load on the line
Exposure groups
|
Group
|
Description
|
|
Reference group 1
|
time-weighted average exposure to magnetic fields, from birth to diagnosis: < 0.05 µT
|
|
Group 2
|
time-weighted average exposure to magnetic fields, from birth to diagnosis: 0.05 - < 0.14 µT
|
|
Group 3
|
time-weighted average exposure to magnetic fields, from birth to diagnosis: ≥ 0.14 µT
|
|
Reference group 4
|
distance of address to closest power line: ≥ 101 m
|
|
Group 5
|
distance of address to closest power line: 51 - 101 m
|
|
Group 6
|
distance of address to closest power line: < 51 m
|
|
Reference group 7
|
calculated magnetic fields closest in time to diagnosis: < 0.05 µT
|
|
Group 8
|
calculated magnetic fields closest in time to diagnosis: 0.05 - < 0.14 µT
|
|
Group 9
|
calculated magnetic fields closest in time to diagnosis: ≥ 0.14 µT
|
|
Group 10
|
calculated magnetic fields during first year of life: 0.05 - < 0.14 µT
|
|
Reference group 11
|
calculated magnetic fields during first year of life: < 0.05 µT
|
|
Group 12
|
calculated magnetic fields during first year of life: ≥ 0.14 µT
|
Population
-
Group:
-
Age:
0–14 years
-
Observation period:
1965 - 1989
-
Study location:
Norway
Case group
Control group
-
Selection:
-
Matching:
- sex
- area
- year of age
- case:control = 1:5
Study size
|
Cases |
Controls |
| Eligible |
532 |
2,112 |
| Participants |
500 |
2,004 |
Other:
cohort of 168 450 children living within the selected wards at least one of the years 1960, 1970, 1980, 1985, 1987 or 1989
Statistical analysis method:
(
adjustment:
- sex
- residential area
- year of birth
)
Results (acc. to author)
Limitations (acc. to author)
No firm conclusions can be drawn because of the small numbers involved.
Study funded by
-
Ministry of Petroleum and Energy, Norway
-
Norwegian Electricity Federation (EnFO), Norway
-
Research Council of Norway
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