The information on depressive symptoms was obtained from the interview schedule known as the Center for Epidemiologic Studies-Depression scale including 18 items describing symptoms or feelings (trouble concentrating, crying spells, feeling hopeful about the future, etc.) and the frequency of these experiences in the previous 7 days. The two questions on headache ( any migraine headache or any other kinds of headaches in the previous 7 days) were adapted from the National Health Interview Survey.
|Reference group 1||proximity to right-of-way of power line: far|
|Group 2||near residences: properties abutting the right-of-way or from which the power line towers are visible|
A association was observed between the prevalence of depressive symptoms and residential proximity to the power line right-of-way (OR 2.8, CI 1.6-5.1). Non-migraine headaches showed a weaker association with proximity to the power line (OR 1.5, Cl 0.8-2.8), and migraine headaches exhibited no association (OR 0.99, Cl 0.3-3.4).
An extremely crude measure of residential proximity to the power line was used.