Study type: Epidemiological study (observational study)

Electromagnetic field exposures and childhood cancers in New Zealand. epidem.

Published in: Cancer Causes Control 1998; 9 (3): 299-309

Aim of study (acc. to author)

The risk for childhood cancer and electromagnetic field exposures was investigated in a population-based case-control study in New Zealand.

Further details

Exposure was assessed by interviews of the mothers about household appliances use, and additionally for leukemia cases and controls by 24-h measurements of electromagnetic fields in the child's bedroom and daytime room.
Correction of data in publication 14173.

Endpoint/type of risk estimation

Type of risk estimation: (odds ratio (OR))

Exposure

Assessment

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

Case group

Control group

Study size

Cases Controls
Eligible 344 441
Participants 303 303
Participation rate 88 % 69 %
Other:

121 children with leukemias, 213 children with solid cancers

Statistical analysis method:

Conclusion (acc. to author)

The data showed no significantly increased risk for the use of household appliances. Leukemia risk was non significantly increased for the mean magnetic fields in the child's bedroom ≥ 0.2 µT (based on 4 cases and 1 control).

Limitations (acc. to author)

The results are based on low numbers and should be interpreted cautiously.

Study funded by

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