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Free Content The association between epidemiological measures of the occurrence of asthma

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Abstract:

SETTING: The prevalence of asthma is useful for studying the causes of asthma.

OBJECTIVE: To ascertain whether there is a relationship between the prevalence and incidence of asthma.

DESIGN: The association between age and the occurrence of asthma was analysed in an epidemiological study of 15813 persons.

RESULTS: Different conclusions were reached depending on whether the point prevalence, cumulative prevalence or the incidence rates were studied. The relation between the incidence and prevalence of asthma is described in two epidemiological models, and none of the models seem to fit empirical data. Furthermore, it is shown that estimating incidence rates by prospectively measuring the point prevalences may introduce a considerable bias if the reliability of the diagnosis of asthma is around or below an agreement of 99%, which is probably usually the case. Including asthmatic symptoms during the last year in the definition of point prevalence means that there is no simple relation between incidence rates and point prevalences.

CONCLUSION: The point prevalence may be a biased measure in the study of the etiology of asthma, as there is no simple relationship between the incidence and prevalence of asthma.

Keywords: age; asthma; epidemiology; incidence; prevalence

Document Type: Regular Paper

Affiliations: 1: Department of Occupational and Environmental Medicine, Umeå University, Umeå, Sweden 2: Department of Occupational and Internal Medicine, Sahlgrenska University Hospital, Göteborg, Sweden; and Department of Respiratory Medicine and Allergology, Sahlgrenska University Hospital, Göteborg, Sweden

Publication date: December 1, 1998

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  • The International Journal of Tuberculosis and Lung Disease publishes articles on all aspects of lung health, including public health-related issues such as training programmes, cost-benefit analysis, legislation, epidemiology, intervention studies and health systems research. The IJTLD is dedicated to the continuing education of physicians and health personnel and the dissemination of information on tuberculosis and lung health world-wide.

    Certain IJTLD articles are selected for translation into French, Spanish, Chinese or Russian. They are available on the Union website

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