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    Differences in the mix of patients among medical specialties and systems of care. Results from the medical outcomes study

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    Authors
    Kravitz, Richard L.
    Greenfield, Sheldon
    Rogers, William H.
    Manning, Willard G. Jr.
    Zubkoff, Michael
    Nelson, Eugene C.
    Tarlov, Alvin R.
    Ware, John E. Jr.
    UMass Chan Affiliations
    Department of Quantitative Health Sciences
    Document Type
    Journal Article
    Publication Date
    1992-04-04
    Keywords
    Activities of Daily Living
    Adult
    Bias (Epidemiology)
    Boston
    Chicago
    Chronic Disease
    Comorbidity
    Cross-Sectional Studies
    Diagnosis-Related Groups
    Female
    Health Services
    Health Status Indicators
    Humans
    Los Angeles
    Male
    Medicine
    Middle Aged
    Multivariate Analysis
    Office Visits
    *Outcome and Process Assessment (Health Care)
    Professional Practice
    data
    Quality of Life
    Sampling Studies
    Severity of Illness Index
    *Specialization
    Biostatistics
    Epidemiology
    Health Services Research
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    Link to Full Text
    http://jama.ama-assn.org/cgi/reprint/267/12/1617
    Abstract
    OBJECTIVE: To determine differences in the mix of patients among medical specialties and among organizational systems of care. STUDY DESIGN: Cross-sectional analysis of 20,158 adults (greater than or equal to 18 years of age) who visited providers' offices during 9-day screening periods in 1986. Patient and physician information was obtained by self-administered, standardized questionnaires. SETTING: Offices of 349 physicians practicing family medicine, internal medicine, endocrinology, and cardiology within health maintenance organizations, large multispecialty groups, and solo or small single-specialty group practices in three major US cities. OUTCOME MEASURES: Demographic characteristics, prevalence of chronic disease, disease-specific severity of illness, and functional status and well-being. RESULTS: Among patients with selected physician-reported chronic illnesses (diabetes, hypertension, recent myocardial infarction, or congestive heart failure), increasing levels of severity were associated with decreasing levels of functional status and well-being and with increased hospitalizations, more physician visits, and higher numbers of prescription drugs. Compared with patients of general internists, patients of cardiologists were older (56 vs 47 years, P less than .01), had worse functional status and well-being scores (P less than .01), and carried more chronic diagnoses (mean 1.32 vs 1.02, P less than .01); patients of family practitioners were younger (40 vs 47 years, P less than .01) and more functional (P less than .01), carried fewer chronic diagnoses (0.70 vs 1.02, P less than .01), and (among diabetic patients only) had lower disease-specific severity scores (2.06 vs 2.30 on a five-point scale, P less than .01). Compared with patients in health maintenance organizations, patients visiting solo practitioners under fee-for-service payment were older (50 vs 45 years, P less than .01) and sicker (had worse physical functioning) and had a higher mean number of chronic diagnoses (1.10 vs 0.93, P less than .01). CONCLUSION: Patient mix is related to utilization and differs significantly across medical specialties and systems of care. These differences must be taken into account when interpreting variations in utilization and outcomes across specialties and systems, and when considering alternative policies for payment.
    Source
    JAMA. 1992 Mar 25;267(12):1617-23. Link to article on publisher's site
    Permanent Link to this Item
    http://hdl.handle.net/20.500.14038/47362
    PubMed ID
    1542171
    Related Resources
    Link to Article in PubMed
    Collections
    Population and Quantitative Health Sciences Publications

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