Study type: Epidemiological study (observational study)

Residential magnetic fields, medication use, and the risk of breast cancer epidem.

Published in: Epidemiology 2007; 18 (2): 266-269

Aim of study (acc. to author)

A case-control study from USA (publication 8545) was extended to evaluate whether breast cancer risk was increased with exposure to magnetic fields among women who use medication.

Further details

Participants of the study (publication 8545) were recontacted and interviewed regarding medication use during the 10 years before diagnosis. Regular use of medication was defined as use at least 4 days a week for 6 months or longer. The interview included following medication classes previously shown to be associated with reduced melatonin levels (publication 7471): calcium channel or beta blocker, psychotherapeutics, corticosteroids, and nonsteroidal anti-inflammatory drugs.

Endpoint/type of risk estimation

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



Exposure groups

Group Description
Group 1 mean nighttime bedroom magnetic field level (constructed variable)


Case group

Control group

Study size

Cases Controls
Eligible 813 793
Participants 558 588
Statistical analysis method: (adjustment: )

Results (acc. to author)

No evidence of an association between increasing nightime bedroom magnetic field level and breast cancer risk was found, regardless of ever-use or duration of use of several medication classes associated with reduced melatonin levels.

Study funded by

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