title: Impact of physician assistant care on office visit resource use in the United States.
abstract: OBJECTIVE
  To investigate whether the use of physician assistants (PAs) as providers for a substantive portion of a patient's office-based visits affects office visit resource use.
  
  
  METHODS
  Medical Expenditure Panel Survey (MEPS) Household Component data from 1996 to 2004.
  
  
  METHODS
  This retrospective cohort study compares the number of office-based visits per year between adults for whom PAs provided >or=30 percent of visits and adults cared for by physicians only.
  
  
  METHODS
  The Agency for Healthcare Research and Quality collects MEPS data using methods designed to produce data representative of the U.S. noninstitutionalized civilian population. Negative binomial regression was used to compare the number of visits per year between persons with and without PA care, adjusted for demographic, geographic, and socioeconomic factors; insurance status; health status; and medical conditions.
  
  
  RESULTS
  After case-mix adjustment, patients for whom PAs provided a substantive portion of care used about 16 percent fewer office-based visits per year than patients cared for by physicians only. This difference in the use of office-based visits was not offset by increased office visit resource use in other settings.
  
  
  CONCLUSIONS
  Results indicate that the inclusion of PAs in the U.S. provider mix does not affect overall office visit resource use.
authors.affiliation: Department of Community and Family Medicine, Duke University Medical Center, 3848 DUMC, Durham, NC 27710, USA. perri.morgan@duke.edu
authors.forename: Perri A
authors.initials: PA
authors.lastname: Morgan
authors.forename: Nilay D
authors.initials: ND
authors.lastname: Shah
authors.forename: Jay S
authors.initials: JS
authors.lastname: Kaufman
authors.forename: Mark A
authors.initials: MA
authors.lastname: Albanese
mesh_terms: D000208:Acute Disease / Q000453:epidemiology; D000328:Adult; D002908:Chronic Disease / Q000453:epidemiology; D015331:Cohort Studies; D003953:Diagnosis-Related Groups / Q000145:classification; D017050:Episode of Care; D005191:Family Characteristics; D005260:Female; D005102:Health Expenditures / Q000706:statistics & numerical data; D006301:Health Services Needs and Demand / Q000706:statistics & numerical data*; D006302:Health Services Research; D006280:Health Workforce; D006801:Humans; D015994:Incidence; D008297:Male; D008511:Medicine / Q000706:statistics & numerical data; D008875:Middle Aged; D009819:Office Visits / Q000706:statistics & numerical data*; D010823:Physician Assistants / Q000706:statistics & numerical data*; D010820:Physicians / Q000145:classification / Q000706:statistics & numerical data*; D012189:Retrospective Studies; D020379:Risk Adjustment; D013038:Specialization; D014481:United States / Q000453:epidemiology