PEDIATRICS Vol. 107 No. 3 March 2001, pp. 505-511
Received Feb 2, 2000; accepted Jun 19, 2000.
,
,
, and
From the * Children's Hospital Medical Center, Cincinnati,
Ohio;
Department of Pediatrics, University of Rochester School of
Medicine, and the American Academy of Pediatrics Center for Child
Health Research, Rochester, New York; and § Department of Pediatrics,
University of California at Davis, Sacramento, California.
Objective. Residential exposures are recognized risk factors for childhood asthma, but the relative contribution of specific risk factors and the overall contribution of housing to asthma in US children is unknown. The objective of this study was to identify risk factors and estimate the population attributable risk of residential exposures for doctor-diagnosed asthma for US children.
Methods. A cross-sectional survey was conducted from 1988 to 1994. Survey participants were 8257 children who were <6 years old and who participated in the Third National Health and Nutrition Examination Survey, a survey of the health and nutritional status of children and adults in the United States. The main outcome measure was doctor-diagnosed asthma, as reported by the parent.
Results. Six percent of children had doctor-diagnosed
asthma. The prevalence of asthma was higher among boys (6.7%) than
girls (5.1%) and was higher among black children (8.9%) than white
children (5.2%). Risk factors for doctor-diagnosed asthma included a
family history of atopy (odds ratio [OR]: 2.2; 95% confidence
interval [CI]: 1.5, 3.1), child's history of allergy to a pet (OR:
24.2; 95% CI: 8.4, 69.5), exposure to environmental tobacco smoke (OR: 1.8; 95% CI: 1.2-2.6), use of a gas stove or oven for heat (OR: 1.8;
95% CI: 1.02-3.2), and presence of a dog in the household (OR: 1.6;
95% CI: 1.1, 2.3). The population attributable risk of
1 residential
exposure for doctor-diagnosed asthma in US children <6 years old was
39.2%, or an estimated 533 000 excess cases, whereas having a family
history of atopy accounted for 300 000. The attributable cost of
asthma as a result of residential exposures for children <6 years old
was $402 million (95% CI: $296-$507 million) annually.
Conclusions. The elimination of identified residential risk factors, if causally associated with asthma, would result in a 39% decline in doctor-diagnosed asthma among US children <6 years old. Key words: NHANES, children, pediatric, prevention, epidemiology, allergic rhinitis, medical costs, day care, housing, pets and environment.
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