Study type: Epidemiological study (observational study)

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

Published in: Lancet 1999; 354 (9194): 1967-1968

Aim of study (acc. to author)

The possible association of electromagnetic field exposures and childhood leukemia is investigated based on the time-weighted average of residental 24-h electric and magnetic field measurements in the bedroom and living room combined for both rooms in comparison to the separate analysis in the former publication.

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 and living room, arithmetic mean: < 0.1 µT
Group 2 magnetic field in bedroom and living room, arithmetic mean: 0.1 - < 0.2 µT
Group 3 magnetic field in bedroom and living room, arithmetic mean: ≥ 0.2 µT
Reference group 4 magnetic field in bedroom and living room, arithmetic mean, lowest third: < 0.0214 µT
Group 5 magnetic field in bedroom and living room, arithmetic mean, middle third: 0.0214 to < 0.0590 µT
Group 6 magnetic field in bedroom and living room, arithmetic mean, highest third: ≥ 0.0590 µT
Reference group 7 electric field in bedroom and living room, arithmetic mean, lowest third: < 5.05 V/m
Group 8 electric field in bedroom and living room, arithmetic mean, middle third: 5.05 - < 14.00 V/m
Group 9 electric field in bedroom and living room, arithmetic mean, highest third: ≥ 14.00 V/m

Population

Case group

Control group

Study size

Cases Controls
Eligible 131 -
Participants 113 113
Statistical analysis method: (adjustment: )

Conclusion (acc. to author)

The odds ratios in this study were lower than the odds ratios analyzed for the bedroom and living room separately in the former publication. There was no significant association between childhood leukaemia and the time-weighted average of the 50 Hz electric and magnetic fields in the bedroom and living room combined.

Limitations (acc. to author)

Only few children were in the highest exposure category.

Study funded by

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