Impact of Adult Asthma

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00005564
Recruitment Status : Completed
First Posted : May 26, 2000
Last Update Posted : March 16, 2016
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI)

Brief Summary:
To assess the separate and interactive effects of asthma severity, subspecialty practice variation, asthma-related psychosocial variables, and other factors on asthma outcomes, including asthma-specific quality of life and activity limitations, health care utilization for asthma, and direct and indirect costs of asthma.

Condition or disease
Asthma Lung Diseases

Detailed Description:


Asthma is both common and costly. Neither the risk factors of poor outcome nor the predictors of better outcome are well understood. Illness severity is clearly an important predictive factor in asthma, but may explain less variability in outcome than other determinants, such as patient-perceived asthma control, other asthma-related psychosocial measures, and the kind and extent of subspecialty care for asthma. By quantifying predictors of asthma-specific quality of life, functional status, services utilization, and the direct and indirect illness costs of asthma, this study addressed a major research gap in secondary and tertiary prevention efforts.


A random sample of pulmonary and allergy subspecialists initially enrolled 600 persons with asthma identified in patient visit logs. This established panel completed 45 minute baseline and follow-up computer-assisted telephone interviews (CATI); 539 (90%) were successfully re-interviewed after 18 months of follow-up. A supplemental sampling frame of persons with asthma identified from family practitioners was completed as was a group with rhinitis but without asthma. Interviews assessed disease severity and other covariables using validated survey instruments. Pulmonary function and medical records were used to validate severity in a sub-sample of subjects. The study extended longitudinal follow-up study of this initial cohort. Its analysis tested predictive models for the asthma outcomes of interest.

The study completion date listed in this record was obtained from the "End Date" entered in the Protocol Registration and Results System (PRS) record.

Study Type : Observational
Study Start Date : July 1997
Study Completion Date : June 2002

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Asthma
U.S. FDA Resources

Information from the National Library of Medicine

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, Learn About Clinical Studies.

Ages Eligible for Study:   up to 100 Years   (Child, Adult, Senior)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   No
No eligibility criteria

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00005564

Sponsors and Collaborators
National Heart, Lung, and Blood Institute (NHLBI)
OverallOfficial: Paul Blanc University of California at San Francisco

Publications: Identifier: NCT00005564     History of Changes
Other Study ID Numbers: 5113
R01HL056438 ( U.S. NIH Grant/Contract )
First Posted: May 26, 2000    Key Record Dates
Last Update Posted: March 16, 2016
Last Verified: July 2004

Additional relevant MeSH terms:
Lung Diseases
Bronchial Diseases
Respiratory Tract Diseases
Lung Diseases, Obstructive
Respiratory Hypersensitivity
Hypersensitivity, Immediate
Immune System Diseases