Study type: Epidemiological study (observational study)

Exposure to residential electric and magnetic fields and risk of childhood leukemia. epidem.

Published in: Am J Epidemiol 1991; 134 (9): 923-937

Aim of study (acc. to author)

The relation between exposure to residential electric and magnetic fields and the risk of childhood leukemia was investigated in a case-control study in California, USA.

Further details

Electric and magnetic field exposure was assessed by 24-hour measurement, spot measurement, Wertheimer-Leeper scheme, and questionnaire about electric appliances use.

Endpoint/type of risk estimation

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

Exposure

Assessment

Exposure groups

Group Description
Reference group 1 mean of 24-hour magnetic field: 0.0 - 0.67 mG
Group 2 mean of 24-hour magnetic field: 0.68 - 1.18 mG
Group 3 mean of 24-hour magnetic field: 1.19 - 2.67 mG
Group 4 mean of 24-hour magnetic field: ≥ 2.68 mG
Reference group 5 magnetic field of spot measurement in child's bedroom: 0 - 0.31 mG
Group 6 magnetic field of spot measurement in child's bedroom: 0.32 - 0.67 mG
Group 7 magnetic field of spot measurement in child's bedroom: 0.68 - 1.24 mG
Group 8 magnetic field of spot measurement in child's bedroom: ≥ 1.25 mG
Reference group 9 Wertheimer-Leeper scheme: underground and very low
Group 10 Wertheimer-Leeper scheme: ordinary low
Group 11 Wertheimer-Leeper scheme: ordinary high
Group 12 Wertheimer-Leeper scheme: very high
Group 13 self-reported appliance use by child: bedroom air conditioner
Group 14 self-reported appliance use by child: black-and-white television
Group 15 self-reported appliance use by child: electric clock
Group 16 self-reported appliance use by child: color television
Group 17 self-reported appliance use by child: curling iron
Group 18 self-reported appliance use by child: electric blanket
Group 19 self-reported appliance use by child: electric fan
Group 20 self-reported appliance use by child: electric clippers
Group 21 self-reported appliance use by child: electric hair dryer
Group 22 self-reported appliance use by child: electric space heater
Group 23 self-reported appliance use by child: microwave oven
Group 24 self-reported appliance use by child: water bed
Group 25 self-reported appliance use by child: video game
Group 26 self-reported appliance use by mother: water bed
Group 27 self-reported appliance use by mother during pregnancy: bedroom air conditioner
Group 28 self-reported appliance use by mother during pregnancy: electric blanket
Group 29 self-reported appliance use by mother during pregnancy: electric fan
Group 30 self-reported appliance use by mother during pregnancy: electric space heater

Population

Case group

Control group

Study size

Cases Controls
Eligible 331 257
Participants 232 232
Statistical analysis method:

Conclusion (acc. to author)

No clear association between the risk of childhood leukemia and magnetic fields, assessed by 24-hour measurements or spot measurements, was found. Electric fields were not associated with the leukemia risk. An association between the Wertheimer-Leeper wiring configuration classification and the risk of childhood leukemia was observed.
The results support an association between the risk of childhood leukemia and wiring configuration, but not direct measurements of electric and magnetic fields.

Study funded by

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