Study type: Epidemiological study (observational study)

Psychological effects of chronic exposure to 50 Hz magnetic fields in humans living near extra-high-voltage transmission lines epidem.

Published in: Bioelectromagnetics 1997; 18 (8): 584-594

Aim of study (acc. to author)

A cross-sectional study was conducted in New Zealand to investigate the association between the exposure to magnetic fields of power lines and psychological and mental health.

Further details

The participants completed following neuropsychological tests: digit span test, trail making tests, digit symbol test, symbol-digit modality test, d2 cancellation test, selective reminding test, visual memory test. Furthermore they filled in the life changes questionnaire and the general health questionnaire-28.

Endpoint/type of risk estimation



Exposure groups

Group Description
Reference group 1 1st quintil, mean average exposure: 0.057 µT; mean time integrated exposure: 0.640 µT-hour
Group 2 2nd quintil, mean average exposure: 0.209 µT; mean time integrated exposure: 2.756 µT-hour
Group 3 3rd quintil, mean average exposure: 0.392 µT; mean time integrated exposure: 5.333 µT-hour
Group 4 4th quintil, mean average exposure: 0.766 µT; mean time integrated exposure: 10.579 µT-hour
Group 5 5th quintil, mean average exposure: 1.944 µT; mean time integrated exposure: 30.761 µT-hour


Study size

Type Value
Evaluable 540
Statistical analysis method: (adjustment: )

Results (acc. to author)

Performance on most memory and attention measures of the participants living close to power lines was unrelated to magnetic field exposure, but significant linear dose-response relationships were found between exposure and some psychological and mental health variables. In particular, higher time-integrated exposure was associated with poorer coding-test performance and more adverse health effects (anxiety, somatic symptoms, depression) . These associations were found to be independent of participants' beliefs about effects of electromagnetic fields.

Study funded by

Related articles