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Original Article
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Volume 340:920-926 March 25, 1999 Number 12
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Passive Smoking and the Risk of Coronary Heart Disease — A Meta-Analysis of Epidemiologic Studies
Jiang He, M.D., Ph.D., Suma Vupputuri, M.P.H., Krista Allen, M.P.H., Monica R. Prerost, M.S., Janet Hughes, Ph.D., and Paul K. Whelton, M.D.

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ABSTRACT

Background The effect of passive smoking on the risk of coronary heart disease is controversial. We conducted a meta-analysis of the risk of coronary heart disease associated with passive smoking among nonsmokers.

Methods We searched the Medline and Dissertation Abstracts Online data bases and reviewed citations in relevant articles to identify 18 epidemiologic (10 cohort and 8 case–control) studies that met prestated inclusion criteria. Information on the designs of the studies, the characteristics of the study subjects, exposure and outcome measures, control for potential confounding factors, and risk estimates was abstracted independently by three investigators using a standardized protocol.

Results Overall, nonsmokers exposed to environmental smoke had a relative risk of coronary heart disease of 1.25 (95 percent confidence interval, 1.17 to 1.32) as compared with nonsmokers not exposed to smoke. Passive smoking was consistently associated with an increased relative risk of coronary heart disease in cohort studies (relative risk, 1.21; 95 percent confidence interval, 1.14 to 1.30), in case–control studies (relative risk, 1.51; 95 percent confidence interval, 1.26 to 1.81), in men (relative risk, 1.22; 95 percent confidence interval, 1.10 to 1.35), in women (relative risk, 1.24; 95 percent confidence interval, 1.15 to 1.34), and in those exposed to smoking at home (relative risk, 1.17; 95 percent confidence interval, 1.11 to 1.24) or in the workplace (relative risk, 1.11; 95 percent confidence interval, 1.00 to 1.23). A significant dose–response relation was identified, with respective relative risks of 1.23 and 1.31 for nonsmokers who were exposed to the smoke of 1 to 19 cigarettes per day and those who were exposed to the smoke of 20 or more cigarettes per day, as compared with nonsmokers not exposed to smoke (P=0.006 for linear trend).

Conclusions Passive smoking is associated with a small increase in the risk of coronary heart disease. Given the high prevalence of cigarette smoking, the public health consequences of passive smoking with regard to coronary heart disease may be important.


Source Information

From the Department of Biostatistics and Epidemiology (J. He, S.V., K.A., M.R.P., J. Hughes, P.K.W.) and the Prevention Research Center (J. He, J. Hughes, P.K.W.), Tulane University School of Public Health and Tropical Medicine, New Orleans.

Address reprint requests to Dr. He at the Department of Biostatistics and Epidemiology, Tulane University School of Public Health and Tropical Medicine, 1430 Tulane Ave., SL18, New Orleans, LA 70112, or at jhe{at}mailhost.tcs.tulane.edu.

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Related Letters:

Passive Smoking and Coronary Heart Disease
Swanson G. D., Denson K. W.E., Wells A. J., Jamrozik K., Colditz G. A., Fuster V., Greenland P., Liu K., Rabinoff M., He J., Hughes J., Whelton P. K., Bailar J. C.
Extract | Full Text  
N Engl J Med 1999; 341:697-700, Aug 26, 1999. Correspondence

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