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Disability and Health Outcomes in COPD

This study has been completed.
National Heart, Lung, and Blood Institute (NHLBI)
Information provided by (Responsible Party):
University of California, San Francisco Identifier:
First received: July 15, 2004
Last updated: December 22, 2015
Last verified: December 2015
To test a conceptual model of how disability develops in chronic obstructive pulmonary disease (COPD).

Chronic Obstructive Pulmonary Disease Lung Diseases

Study Type: Observational
Study Design: Observational Model: Case Control
Time Perspective: Prospective
Official Title: Disability and Health Outcomes in COPD

Further study details as provided by University of California, San Francisco:

Primary Outcome Measures:
  • COPD Disability [ Time Frame: 10 years ]
    Observational self-reported impairment in valued life activities.

Enrollment: 1589
Study Start Date: July 2004
Study Completion Date: May 2009
Primary Completion Date: May 2009 (Final data collection date for primary outcome measure)
Detailed Description:


Background. COPD is a common chronic health condition. Because current medical treatments have minimal impact on disease progression, a strategy to prevent COPD-related disability would have important clinical and public health benefits.


The study will test a specific conceptual model of how disability develops in COPD. The aims are: (1) To evaluate the impact of respiratory impairment, especially pulmonary function impairment, on the risk of functional limitation in COPD. Using a control group, to elucidate the prevalence of respiratory impairment, functional limitation, and disability that is directly attributable to COPD. (2) In adults with COPD, to delineate the longitudinal effect of functional limitation on the risk of incident disability. The investigators hypothesize that development of functional limitation, and not pulmonary function impairment, is the major determinant of disability. (3) To determine the prospective impact of disability on the risk of future adverse health outcomes. The investigators will assemble a prospective cohort of 1200 randomly sampled adults with COPD who are members of a large regional health maintenance organization. A matched control group of 300 subjects will be recruited. Subjects will undergo a detailed physical assessment that measures respiratory impairment (e.g., pulmonary function) and functional limitation (e.g., lower extremity function, muscle strength, exercise performance, and cognitive function). Structured telephone interviews will ascertain disability outcomes at baseline and 18-month prospective follow-up. The investigators will also study the modulating effects of specific risk factors and protective factors on the progression from functional limitation to COPD-related disability, including psychological factors, environmental exposures, and health care process factors.


Ages Eligible for Study:   up to 55 Years   (Child, Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population
We recruited persons with COPD for what we came to term the "FLOW study." The original project was funded to complete two interviews and a single research clinic evaluation. In addition to completing this original program of work successfully, we also carried out follow-up research clinic visits for 667 subjects. These supplemental examinations were made possible through research funding support from the Flight Attendants Medical Research Foundation (FAMRI).


  1. COPD diagnosis and
  2. Medication use for cases


1. Withdrew from Kaiser Plan prior to baseline contact

  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00087906

Sponsors and Collaborators
University of California, San Francisco
National Heart, Lung, and Blood Institute (NHLBI)
Principal Investigator: Paul Blanc, MD University of California at San Francisco
  More Information

Responsible Party: University of California, San Francisco Identifier: NCT00087906     History of Changes
Other Study ID Numbers: 1262
R01HL077618 ( U.S. NIH Grant/Contract )
Study First Received: July 15, 2004
Last Updated: December 22, 2015
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

Additional relevant MeSH terms:
Lung Diseases
Lung Diseases, Obstructive
Pulmonary Disease, Chronic Obstructive
Respiratory Tract Diseases processed this record on August 18, 2017