Study type:
Epidemiological study
(observational study)
Electromagnetic field exposures and childhood cancers in New Zealand
epidem.
By:
Dockerty JD, Elwood JM, Skegg DC, Herbison GP
Published in: Cancer Causes Control 1998; 9 (3): 299-309
Aim of study (acc. to author)
Further details
Endpoint/type of risk estimation
Type of risk estimation:
(odds ratio (OR))
Exposure
Assessment
- interview: household appliance: mother's use during pregnancy or 3 months before, child's use prior reference date (e.g., electric blanket, waterbed, elect. bedside clock, hair dryer, computer monitor, elect. sewing machine, vacuum cleaner, amateur radio)
- measurement: magnetic field, electric field, electromagnetic transient fields for 24 h every 60 sec in child's daytime room and bedroom
Exposure groups
|
Group
|
Description
|
|
Reference group 1
|
magnetic field in bedroom, arithmetic mean: < 0.1 µT
|
|
Group 2
|
magnetic field in bedroom, arithmetic mean: 0.1 to < 0.2 µT
|
|
Group 3
|
magnetic field in bedroom, arithmetic mean: ≥ 0.2 µT
|
|
Reference group 4
|
magnetic field in daytime room, arithmetic mean: < 0.1 µT
|
|
Group 5
|
magnetic field in daytime room, arithmetic mean: 0.1 to < 0.2 µT
|
|
Group 6
|
magnetic field in daytime room, arithmetic mean: ≥ 0.2 µT
|
|
Reference group 7
|
electric field in bedroom, lowest third: < 3.64 V/m
|
|
Group 8
|
electric field in bedroom, middle third: 3.64 to ≥ 10.75 V/m
|
|
Group 9
|
electric field in bedroom, highest third: ≥ 10.75 V/m
|
|
Reference group 10
|
electric field in daytime room, lowest third: < 3.64 V/m
|
|
Group 11
|
electric field in daytime room, middle third: 3.64 to ≥ 10.75 V/m
|
|
Group 12
|
electric field in daytime room, highest third: ≥ 10.75 V/m
|
Population
-
Group:
-
Age:
0–14 years
-
Observation period:
1990 - 1993
-
Study location:
New Zealand
Case group
Control group
-
Selection:
-
Matching:
- sex
- age
- case:control = 1:1
Study size
|
Cases |
Controls |
| Eligible |
344 |
441 |
| Participants |
303 |
303 |
| Participation rate |
88 % |
69 % |
Statistical analysis method:
- conditional logistic regression
Results (acc. to author)
Limitations (acc. to author)
The results are based on low numbers and should be interpreted cautiously.
Study funded by
-
A.B. de Lautour Charitable Trust, New Zealand
-
Cancer Society of New Zealand
-
Health Research Council of New Zealand
-
New Zealand Lottery Grants Board
-
Otago Medical Research Foundation, New Zealand
-
Otago Medical School (Faculty Bequest Funds), New Zealand
-
Transpower New Zealand
Comments on this article
-
Dockerty JD et al.
(1999):
Correction to: Electromagnetic field exposures and childhood cancers in New Zealand. in: Cancer Causes and Control 1998; 9 (3): 299-309
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