title: Health status disparities among public and private emergency department patients.
abstract: OBJECTIVE
  To explore whether patients in a public ED had poorer health than patients in a private ED, the authors compared the physical and mental health statuses of patients seeking emergency care.
  
  
  METHODS
  A cross-sectional observational study of all adult patients, regardless of acuity, seen during two 24-hour periods in spring 1997 in an urban county trauma center (68,000 annual visits) and a private community ED (35,000 annual visits). Scores on the Physical Component Summary (PCS) and the Mental Component Summary (MCS) scales of the Medical Outcomes Study 12-Item Short-Form Health Survey (SF-12) were compared between sites, with published national norms, and with hospital admission.
  
  
  RESULTS
  Of 571 eligible patients, 392 (69%) completed the SF-12. Patients in the public ED had a mean PCS score of 40.1, compared with 43.7 for patients in the private ED, for a difference of 3.6 points (p < 0.01; 95% CI = 0.9 to 6.1). After controlling for age, sex, ethnicity, triage acuity, ambulance arrival, and insurance status, this difference increased to 3.9 points (p = 0.02; 95% CI = 0.7 to 7.0). The mean MCS score among public ED patients was 44.1, compared with 46.5 in the private ED population, for a difference of 2.4 (p = 0.08; 95% CI = -0.3 to 5.0); after adjustment this difference increased to 2.5 (p = 0.15; 95% CI = -0.9 to 5.8), but remained statistically not significant. While all scores were significantly lower than national norms (mean PCS 50.1, mean MCS 50.0), patients in the public ED scored consistently lowest. PCS score was significantly inversely correlated with admission, with each point decrease in PCS score increasing the odds of admission by 0.05 (95% CI = 0.01 to 0.08), and conferring an odds ratio of 5.1 (95% CI = 1.2 to 21.1) for admission among the 25th percentile for PCS scores.
  
  
  CONCLUSIONS
  Patients seeking care in the public ED had lower adjusted physical health status scores than comparable patients obtaining care in a private ED. The SF-12 is sufficiently responsive to detect hypothesized differences between ED populations, and correlates well with admission decisions.
authors.affiliation: Alameda County Medical Center, Oakland, CA, USA. halter@u.washington.edu
authors.forename: H J
authors.initials: HJ
authors.lastname: Alter
authors.forename: R
authors.initials: R
authors.lastname: Braun
authors.forename: J L
authors.initials: JL
authors.lastname: Zazzali
mesh_terms: D000328:Adult; D002140:California / Q000453:epidemiology; D003430:Cross-Sectional Studies; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D005260:Female; D006300:Health Services Misuse / Q000706:statistics & numerical data*; D006304:Health Status; D006305:Health Status Indicators; D006306:Health Surveys; D016304:Hospitals, Private / Q000706:statistics & numerical data*; D006779:Hospitals, Public / Q000706:statistics & numerical data*; D006801:Humans; D007348:Insurance, Health / Q000706:statistics & numerical data; D008297:Male; D008875:Middle Aged; D010342:Patient Acceptance of Health Care; D013223:Statistics as Topic; D014218:Triage / Q000706:statistics & numerical data