|Reference group 1||unexposed workers|
|Group 2||exposed workers|
132 exposed workers and 143 unexposed workers
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.