American Journal of Epidemiology Vol. 137, No. 10: 1089-1097
Copyright © 1993 by The Johns Hopkins University School of Hygiene and Public Health
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Measuring Exposure to Environmental Tobacco Smoke in Studies of Acute Health Eftects
1Section of Chronic Disease and Environmental Epidemiology, Minnesota Department of Health Minneapolis, MN
2Department of Family and Community Medicine, University of Massachusetts Worcester, MA
3American Health Foundation Valhalla, NY
Reprint requests to Dr. Marian C Marbury, Section of Chronic Disease and Environmental Epidemiology, Minnesota Department of Health, 717 S E Delaware St., Minneapolis, MN 55414.
The relations among three methods of measuring exposure to environmental tobacco smoke, questionnaires, urinary cotinine, and a passive monitor for ambient nicotine, were investigated in a study of 48 children in Minnesota in 1989. Subjects were all under 2 years of age and did not attend day care. Passive nicotine monitors were placed in the activity room and the child's bedroom for 1 week, urine samples were collected at the beginning and end of the week for cotinine analysis, and a detailed questionnaire concerning cigarette smoking was administered at the end of the week. These same measures were obtained weekly for 8 weeks for 22 of the children. Among households with smokers, concentrations of ambient nicotine and urinary cotinine were lowest when the father smoked, intermediate when the mother smoked, and highest when both parents smoked. Activity room concentrations were highly correlated with both urinary cotinine (r = 0.81) and the total number of cigarettes smoked in the house (r = 0.86). Regression equations indicated that knowing who smoked in the house was a more important predictor of ambient nicotine than knowing the amount smoked. Both urinary cotinine and ambient nicotine demonstrated variability over time, although ambient nicotine was less variable. In addition, 100% of possible ambient nicotine samples were collected in contrast to 80% of urine samples. The results of the study suggest that both urinary cotinine and ambient nicotine provide better information about the exposure of young children to environmental tobacco smoke than questionnaire data alone, and that ambient nicotine may be the more useful in this population based on its greater stability and ease of collection.
cotinine; environmental exposure; environmental monitoring; epidemiologic methods; nicotine; questionnaires; smoking; tobacco smoke pollution
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