title: Relationship between the National ED Overcrowding Scale and the number of patients who leave without being seen in an academic ED.
abstract: OBJECTIVE
  We hypothesize that the number of patients who leave without being seen is correlated with the simple-to-use National Emergency Department Overcrowding Scale (NEDOCS).
  
  
  METHODS
  Results of a 6-item ED overcrowding scale (NEDOCS) were collected prospectively over a 17-day study period. The following additional data were extracted from records for each 2-hour study period: (1) number of registered patients, (2) number of ambulances that arrived, and (3) number of patients signed in that hour who eventually left without being seen. Spearman correlation coefficients were computed for the leaving without being seen (LWBS) rate with the NEDOCS score at the time of patient presentation and 2, 4, and 6 hours later.
  
  
  RESULTS
  The study period represents two hundred fourteen 2-hour periods. The LWBS rate was determined for 100% of the times; NEDOCS scores were determined for a sampling of 62% of the times spread equally over all hours of the day and days of the week. Correlation between the NEDOCS score and LWBS was 0.665.
  
  
  CONCLUSIONS
  The NEDOCS score is well correlated with LWBS.
authors.affiliation: Department of Emergency, University of New Mexico, Albuquerque 87131-0001, USA. sweiss52@aol.com
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Weiss
authors.forename: Amy A
authors.initials: AA
authors.lastname: Ernst
authors.forename: Robert
authors.initials: R
authors.lastname: Derlet
authors.forename: Richard
authors.initials: R
authors.lastname: King
authors.forename: Aaron
authors.initials: A
authors.lastname: Bair
authors.forename: Todd G
authors.initials: TG
authors.lastname: Nick
mesh_terms: D000046:Academic Medical Centers; D003441:Crowding; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D006801:Humans; D010352:Patient Dropouts / Q000706:statistics & numerical data*; D011446:Prospective Studies; D013997:Time Factors; D014505:Urban Population