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Age and Ageing Advance Access published online on May 17, 2005
Age and Ageing, doi:10.1093/ageing/afi092
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© The Author 2005. Published by Oxford University Press on behalf of the British Geriatrics Society. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received September 20, 2004
Accepted March 9, 2005

Article

Changing age-pattern of hospitalisation risk of chronic obstructive pulmonary disease in men and women in Canada

Yue Chen 1*, Paula Stewart 2, Robert Dales 3, Helen Johansen 4, Shirley Bryan 5, and Gregory Taylor 6

1 Department of Epidemiology and Community Medicine, Faculty of Medicine, University of Ottawa, 451 Smyth Road, Ottawa, Ontario, Canada K1H 8M5
2 Centre of Chronic Disease Prevention and Control, Public Health Agency of Canada, 120 Colonnade, Ottawa, Ontario, Canada K1A 0K9
3 Department of Medicine, University of Ottawa, Box 201, 501 Smyth Road, Ottawa, Ontario, Canada K1H 8L6
4 Health Statistics Division at Statistics Canada, Main Building, Room 2602, Ottawa, Canada K1A 0T6
5 Canadian Health Measures Survey, Statistics Canada, Main Building, Room 2200, Ottawa, Canada K1A 0T6 (The work was done at the Centre for Chronic Disease Prevention and Control)
6 Centre of Chronic Disease Prevention and Control at Health Canada, 120 Colonnade, Ottawa, Ontario, Canada K1A 1K4

* To whom correspondence should be addressed.
Yue Chen, E-mail: ychen{at}uottawa.ca


  Abstract

Objective: to examine the changing pattern of age distributions of hospitalisation for chronic obstructive pulmonary disease (COPD) among Canadian men and women.

Design: retrospective cohort study.

Participants: 257,604 COPD inpatients aged 55-90 years with 463,089 hospital admissions during a 3-year study period (1994/95, 1995/96 and 1996/97) in Canada.

Main outcome measures: COPD listed as one of the first five underlying diagnoses (broad definition, 463,089 hospitalisations) or as first diagnosis (narrow definition, 142,770 hospitalisations).

Results: overall, men were more likely to have hospitalisations for COPD and had a higher proportion of death at hospital than did women. The 3-year cumulative incidence was 42.2/1,000 for the broadly defined COPD hospitalisation and 14.0/1,000 for the narrowly defined COPD hospitalisation, and steadily increased with increasing age. The relative risk for women versus men gradually increased with decreasing age, and was significantly greater than unity in the 55-59 year group for narrowly defined COPD hospitalisation.

Conclusions: in terms of impact on secondary care COPD is a disease of the elderly and is becoming more common in women, particularly in younger age groups.

Keywords: COPD, database, hospitalisation, age, women, elderly.
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