Study type:
Epidemiological study
(observational study)
Power-frequency electric and magnetic fields and risk of childhood leukemia in Canada
epidem.
By:
McBride ML, Gallagher RP, Theriault G, Armstrong BG, Tamaro S, Spinelli JJ, Deadman JE, Fincham S, Robson D, Choi W
Published in: Am J Epidemiol 1999; 149 (9): 831-842
Aim of study (acc. to author)
Endpoint/type of risk estimation
Type of risk estimation:
(odds ratio (OR))
Exposure
Assessment
Exposure groups
Group
|
Description
|
Reference group 1
|
time-weighted average of measured magnetic field: < 0.08 µT
|
Group 2
|
time-weighted average of measured magnetic field: 0.08 - < 0.15 µT
|
Group 3
|
time-weighted average of measured magnetic field: 0.15 - < 0.27 µT
|
Group 4
|
time-weighted average of measured magnetic field: 0.27 - < 1.61 µT
|
Reference group 5
|
time-weighted average of measured magnetic field: < 0.2 µT
|
Group 6
|
time-weighted average of measured magnetic field: ≥ 0.2 µT
|
Reference group 7
|
Wertheimer-Leeper code: underground
|
Group 8
|
Wertheimer-Leeper code: very low
|
Group 9
|
Wertheimer-Leeper code: ordinary low
|
Group 10
|
Wertheimer-Leeper code: ordinary high
|
Group 11
|
Wertheimer-Leeper code: very high
|
Reference group 12
|
Kaune-Savitz code: low
|
Group 13
|
Kaune-Savitz code: medium
|
Group 14
|
Kaune-Savitz code: high
|
Reference group 15
|
time-weighted average of measured electric field: < 12.2 V/m
|
Group 16
|
time-weighted average of measured electric field: 12.2 - < 17.2 V/m
|
Group 17
|
time-weighted average of measured electric field: 17.2 - < 24.6 V/m
|
Group 18
|
time-weighted average of measured electric field: 24.6 - < 64.7 V/m
|
Reference group 19
|
time-weighted average of measured electric field: < 20 V/m
|
Group 20
|
time-weighted average of measured electric field: ≥ 20 V/m
|
Population
-
Group:
-
Age:
0–14 years
-
Observation period:
January 1990 - December 1994, until June 1995 in British Columbia and Quebec
-
Study location:
Canada (provinces of British Columbia, Alberta, Saskatchewan, Manitoba and Quebec)
Case group
Control group
-
Selection:
-
Matching:
- sex
- age
- province
- case:control = 1:1
Study size
|
Cases |
Controls |
Eligible |
445 |
526 |
Participants |
399 |
399 |
Participation rate |
90 % |
76 % |
Statistical analysis method:
- conditional logistic regression
(
adjustment:
)
Results (acc. to author)
Study funded by
-
Canadian Electricity Association (CEA), Canada
-
Electric Power Research Institute (EPRI), USA
-
Health Canada
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