Clinical Epidemiology of Asthma in An HMO

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: NCT00005291
Recruitment Status : Completed
First Posted : May 26, 2000
Last Update Posted : February 18, 2016
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI)

Brief Summary:
To provide information on morbidity and health care utilization for asthma for a large, well-defined population over a 20 year period.

Condition or disease
Asthma Lung Diseases

Detailed Description:


Asthma is the second most common chronic respiratory disorder seen by physicians in outpatients, and in 1988 was estimated to be the primary or secondary cause of 9.3 percent of all physician office visits for ambulatory medical care in the United States. Reports citing increased asthma morbidity and mortality in this country and abroad have intensified interest in this disorder. Investigations into possible explanations for these increases, however, have been hampered by the lack of good longitudinal data on the incidence, prevalence, and health care utilization associated with asthma, and by the lack of generally accepted diagnostic criteria for defining the disease.


Use of the Kaiser-Permanente Northwest Region data base allowed an examination of the secular trends in the prevalence and incidence of physician-diagnosed asthma and asthma-like disorders in inpatient and outpatient populations over a 20 year period, health care utilization and temporal changes in utilization patterns for asthma, and the natural history of asthma in selected subpopulations. Demographic factors examined were limited to age and sex.

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 1988
Actual Study Completion Date : April 2003

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Asthma
U.S. FDA Resources

Information from the National Library of Medicine

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

Publications: Identifier: NCT00005291     History of Changes
Other Study ID Numbers: 2013
R29HL041039 ( U.S. NIH Grant/Contract )
First Posted: May 26, 2000    Key Record Dates
Last Update Posted: February 18, 2016
Last Verified: June 2000

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