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Visits to physicians before and after exposure to urea formaldehyde foam insulation.

K A L'Abbé, J R Hoey, J Hanley, S Wacholder and A Nantel

Department of Community Health, Montreal General Hospital.

The average number of visits to a physician made by a sample of 351 residents of homes insulated with urea formaldehyde foam insulation in Montreal in the one year period before exposure was 5.25, and in the year following 5.62, an increase of 7 per cent (odds ratio 1.07, 95% CI = 1.00, 1.15). The increase in visits in the post insulation year was limited to subjects who had the product installed in the winter (OR = 1.48, 95% CI = 1.18,1.85), and was not seen for study subjects who insulated their homes during other seasons of the year.