Study type: Epidemiological study

The effect of chronic exposure to extremely low-frequency electromagnetic fields on sleep quality, stress, depression and anxiety epidem.

Published in: Electromagn Biol Med 2019; 38 (1): 96-101

Aim of study (acc. to author)

A cross-sectional study was conducted in Iran to evaluate the effects of extremely low frequency magnetic fields on sleep quality, stress, depression and anxiety in power plant workers.

Further details

Sleep quality was assessed by the Pittsburgh Sleep Quality Index. Stress, depression, and anxiety were assessed by a short version of the Depression, Anxiety and Stress Scale.

Endpoint/type of risk estimation



Exposure groups

Group Description
Reference group 1 unexposed workers
Group 2 exposed workers


Study size

Type Value
Total 275

132 exposed workers and 143 unexposed workers

Statistical analysis method:

Results (acc. to author)

The mean measured magnetic flux density was 29.2 ± 27.6 µT. Technicians were most exposed (58.7 ± 44.9 µT) and office workers were less exposed (13.9 ± 3.1 µT).
The workers in the exposed group experienced significantly poorer sleep quality and more often depression than the unexposed group. Stress, depression, and anxiety had a linear trend with increased exposure. Sleep quality in technicians with the highest exposure was significantly lower than the other groups.
The authors conclude that the results suggest that long-term occupational exposure to extremely low-frequency magnetic fields may lead to depression, stress, anxiety and poor sleep quality.

Study funded by

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