Study type: Epidemiological study (observational study)

Case-control study of childhood cancer and exposure to 60-Hz magnetic fields. epidem.

Published in: Am J Epidemiol 1988; 128 (1): 21-38

Aim of study (acc. to author)

A case-control study was conducted in the USA to investigate the relation between residential exposure to magnetic fields and the development of childhood cancer.

Further details

Electric and magnetic fields exposure was assessed by measurements in the residence where the child lived prior diagnosis and by wire configuration code.

Endpoint/type of risk estimation

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

Exposure

Assessment

Exposure groups

Group Description
Reference group 1 magnetic fields, low power use conditions: 0 - < 0.65 mG
Group 2 magnetic fields, low power use conditions: 0.65 - < 1.0 mG
Group 3 magnetic fields, low power use conditions: 1.0 - < 2.5 mG
Group 4 magnetic fields, low power use conditions: ≥ 2.5 mG
Reference group 5 magnetic fields, high power use conditions: 0 - < 0.65 mG
Group 6 magnetic fields, high power use conditions: 0.65 - < 1.0 mG
Group 7 magnetic fields, high power use conditions: 1.0 - < 2.5 mG
Group 8 magnetic fields, high power use conditions: ≥ 2.5 mG
Reference group 9 electric fields, high power use conditions: 0 - < 6.0 V/m
Group 10 electric fields, high power use conditions: 6.0 - < 9.0 V/m
Group 11 electric fields, high power use conditions: 9.0 - < 14.0 V/m
Group 12 electric fields, high power use conditions: ≥ 14.0 V/m
Group 13 magnetic fields, low power use conditions: < 2.0 mG
Group 14 magnetic fields, low power use conditions: ≥ 2.0 mG
Group 15 magnetic fields, high power use conditions: < 2.0 mG
Group 16 magnetic fields, high power use conditions: ≥ 2.0 mG
Group 17 electric fields, high power use conditions: < 12.0 V/m
Group 18 electric fields, high power use conditions: ≥ 12.0 V/m
Reference group 19 wire code at time of diagnosis: buried
Group 20 wire code at time of diagnosis: very low
Group 21 wire code at time of diagnosis: low
Group 22 wire code at time of diagnosis: high
Group 23 wire code at time of diagnosis: very high
Reference group 24 wire code 2 years before diagnosis: buried
Group 25 wire code 2 years before diagnosis: very low
Group 26 wire code 2 years before diagnosis: low
Group 27 wire code 2 years before diagnosis: high
Group 28 wire code 2 years before diagnosis: very high
Reference group 29 wire code: buried, very low and low
Group 30 wire code: high and very high

Population

Case group

Control group

Study size

Cases Controls
Eligible 356 278
Participants 252 222
Participation rate 71 % 80 %
Statistical analysis method:

Conclusion (acc. to author)

Measurements of electric and magnetic fields were taken at 128 residences of cases and in 207 of controls, wire codes were obtained for 319 cases and 259 controls.
A modest association for childhood cancer and magnetic fields measured under low power conditions was observed whereas no association for magnetic fields measured under high power conditions was found. Electric fields were not related to childhood cancer. An increased risk for all types of cancer was observed for high and very high wire codes.

Study funded by

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