Clinical Epidemiology of Asthma in An HMO - Tabular View

Tracking Information
First Received Date ^ICMJE	May 25, 2000
Last Updated Date	June 23, 2005
Start Date ^ICMJE	July 1988
Primary Completion Date
Current Primary Outcome Measures ^ICMJE
Original Primary Outcome Measures ^ICMJE
Change History	Complete list of historical versions of study NCT00005291 on ClinicalTrials.gov Archive Site
Current Secondary Outcome Measures ^ICMJE
Original Secondary Outcome Measures ^ICMJE

Descriptive Information
Brief Title ^ICMJE	Clinical Epidemiology of Asthma in An HMO
Official Title ^ICMJE
Brief Summary	To provide information on morbidity and health care utilization for asthma for a large, well-defined population over a 20 year period.
Detailed Description	BACKGROUND: 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. DESIGN NARRATIVE: 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.
Study Phase
Study Type ^ICMJE	Observational
Study Design ^ICMJE	Natural History
Condition ^ICMJE	Asthma Lung Diseases
Intervention ^ICMJE
Study Arms / Comparison Groups
Publications *	Vollmer WM, Buist AS, Osborne ML. Twenty year trends in hospital discharges for asthma among members of a health maintenance organization. J Clin Epidemiol. 1992 Sep;45(9):999-1006. Osborne ML, Vollmer WM, Buist AS. Diagnostic accuracy of asthma within a health maintenance organization. J Clin Epidemiol. 1992 Apr;45(4):403-11. Osborne ML, Vollmer WM, Johnson RE, Buist AS. Use of an automated prescription database to identify individuals with asthma. J Clin Epidemiol. 1995 Nov;48(11):1393-7. Vollmer WM, Osborne ML, Buist AS. Temporal trends in hospital-based episodes of asthma care in a health maintenance organization. Am Rev Respir Dis. 1993 Feb;147(2):347-53. Vollmer WM, Osborne ML, Buist AS. 20-year trends in the prevalence of asthma and chronic airflow obstruction in an HMO. Am J Respir Crit Care Med. 1998 Apr;157(4 Pt 1):1079-84. Osborne ML, Vollmer WM, Buist AS. Periodicity of asthma, emphysema, and chronic bronchitis in a northwest health maintenance organization. Chest. 1996 Dec;110(6):1458-62.
* Includes publications given by the data provider as well as publications identified by National Clinical Trials Identifier (NCT ID) in Medline.

Recruitment Information
Recruitment Status ^ICMJE	Completed
Enrollment ^ICMJE
Completion Date	April 1993
Primary Completion Date
Eligibility Criteria ^ICMJE	No eligibility criteria
Gender	Male
Ages
Accepts Healthy Volunteers	No
Contacts ^ICMJE	Contact information is only displayed when the study is recruiting subjects
Location Countries ^ICMJE

Administrative Information
NCT ID ^ICMJE	NCT00005291
Responsible Party
Study ID Numbers ^ICMJE	2013
Study Sponsor ^ICMJE	National Heart, Lung, and Blood Institute (NHLBI)
Collaborators ^ICMJE
Investigators ^ICMJE
Information Provided By	National Heart, Lung, and Blood Institute (NHLBI)
Verification Date	June 2000
^ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP