West Sweden Asthma Study: Prevalence Trends over the Last 18 Years Argues No Recent Increase in Asthma

Overview

Journal Respir Res

Specialty Pulmonary Medicine

Date 2009 Oct 14

PMID 19821983

Citations 55

Authors

Jan Lotvall

Linda Ekerljung

Erik P Ronmark

Goran Wennergren

Anders Linden

Eva Ronmark

Kjell Toren

Bo Lundback

Affiliations

Soon will be listed here.

Abstract

Asthma prevalence has increased over the last fifty years, but the more recent changes have not been conclusively determined. Studies in children indicate that a plateau in the prevalence of asthma may have been reached, but this has not yet been confirmed in adults. Epidemiological studies have suggested that the prevalence of asthma in adults is approximately 7-10% in different parts of the western world. We have now performed a large-scale epidemiological evaluation of the prevalence of asthma and respiratory symptoms in adults between the ages of 16-75 in West Sweden. Thirty thousand randomly chosen individuals were sent a detailed questionnaire focusing on asthma and respiratory symptoms, as well possible risk factors. Sixty-two percent of the contacted individuals responded to the questionnaire. Asthma prevalence, defined as asthma diagnosed by a physician, was 8.3%. Moreover, the prevalence of respiratory symptoms was lower compared to previous studies. The most common respiratory symptom was any wheeze (16.6%) followed by sputum production (13.3%). In comparison with studies performed 18 years ago, the prevalence of asthma has not increased, and the prevalence of most respiratory symptoms has decreased. Therefore, our data argues that the continued increase in asthma prevalence that has been observed over the last half century is over.

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