© 1995 Oxford University Press
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Comparison of Three Methods for Estimating Environmental Tobacco Smoke Exposure among Children Aged between 12 and 36 Months
* Department of Epidemiology, National Institute of Public Health Geitmyrsvn. 75, 0462 Oslo, Norway
** Department of Pharmacology and Toxicology, Faculty of Medicine, University of Trondheim Norway
Telemark Central Hospital Porsgrunn, Norway
Department of Thoracic Medicine Rikshospitalet, Oslo, Norway
Background. The methods currently used for measuring environmental tobacco smoke (ETS) exposure among small children all have their limitations. The aim of this study was to compare the results of questionnaire assessments of children's ETS exposure with continine measurements in unne and nicotine measurements In hair, a new method for estimating average ETS exposure.
Methods Questionnaire information on ETS exposure and a sample of hair were collected from 94 children aged 12–36 months. A urine sample for cotinine analysis was obtained from 72 of the children.
Results. Nicotine was found in all hair samples and cotinine in all urine samples. Compared to children registered as unexposed by the questionnaire, hair nicotine levels were 12.4 times higher among children exposed to more than 10 DNC (daily number of cigarettes) (P< 0.001) and 3.6 times higher among children exposed to 1–10 DNC (P < 0.001). The median continine creatinine ratio (CCR) was 2.4 times higher among children exposed to more than 10 DNC compared to unexposed children (P< 0.001). No significant difference In median CCR was found between unexposed children and children exposed to 1–10 DNC. The correlation coefficient was 0.64 between children's hair nicotine levels and DNC, 0.50 between CCR and DNC and 0.56 between children's hair nicotine levels and CCR.
Conclusion. Nicotine measurement in hair is a practical and valid method for estimating average ETS exposure in children. An underreporting of ETS exposure was indicated.
Received 1 July 1994
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