Chest
Original ResearchSeven-Year Cumulative Incidence of COPD in an Age-Stratified General Population Sample
Section snippets
Study Population
The Obstructive Lung Disease in Northern Sweden (OLIN) studies have collected epidemiologic data since 1985 to 1986 with a focus on allergy and obstructive lung disease (OLD).415161718 This study is a follow-up of the first OLIN cohort that was recruited in 1985 to 1986, when a postal questionnaire was sent to all 6,610 subjects born in 1919 to 1920 (age group I), 1934 to 1935 (age group II), and 1949 to 1950 (age group III) in eight representative areas of northern Sweden.16 In 1996, the
Incidence of COPD
During the observation period of 7 years, COPD developed in 45 subjects (25 women) according to the GOLD II criteria and in 91 subjects (52 women) according to the GOLD criteria, which corresponds to a cumulative incidence of 4.9% (95% CI, 3.6 to 6.5) and 11.0% (95% CI, 9.0 to 13.4), respectively. The cumulative incidence was significantly associated with smoking. The cumulative incidence of COPD (GOLD II criteria) was more than six times higher among smokers (10.8%) compared to nonsmokers
Discussion
The 7-year cumulative incidence of COPD was estimated at 4.9% and 11.0%, respectively, according to the spirometric criteria of GOLD II and GOLD, and was strongly associated with smoking but not gender. The cumulative incidence of COPD according to GOLD criteria, but not according to GOLD II criteria, was associated with increasing age. The cumulative incidence of COPD according to GOLD II criteria corresponds to an annual incidence rate of 7 per 1,000 persons per year in the total population,
ACKNOWLEDGMENT
The research assistants Linnea Hedman, Ann-Christin Jonsson, and Sigrid Sundberg, and statistician Ola Bernhoff are acknowledged for collecting and entering the data into the computerized database.
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Reproduction of this article is prohibited without written permission from the American College of Chest Physicians (www.chestjournal.org/misc/reprints.shtml).
This research was supported by The Swedish Heart-Lung Foundation and the Norrbotten′s Health Care Authority. The GlaxoSmithKline R&D department is acknowledged for additional financial support.